Quinoline derivatives and their use as mycobacterial inhibitors.

The present invention relates to novel substituted quinoline derivatives useful for the treatment of mycobacterial diseases, particularly those diseases caused by pathogenic mycobacteria such as Mycobacterium tuberculosis, M. bovis, M. avium and M. marinum.

Mycobacterium tuberculosis is the causative agent of tuberculosis (TB), a serious and potentially fatal infection with a world-wide distribution. Estimates from the World Health Organization indicate that more than 8 million people contract TB each year, and 2 million people die from tuberculosis yearly. In the last decade, TB cases have grown 20% worldwide with the highest burden in the most impoverished communities. If these trends continue, TB incidence will increase by 41% in the next twenty years. Fifty years since the introduction of an effective chemotherapy, TB remains after AIDS, the leading infectious cause of adult mortality in the world. Complicating the TB epidemic is the rising tide of multi-drug- resistant strains, and the deadly symbiosis with HIV. People who are HIV-positive and infected with TB are 30 times more likely to develop active TB than people who are HIV-negative and TB is responsible for the death of one out of every three people with HIV/AIDS worldwide

Existing approaches to treatment of tuberculosis all involve the combination of multiple agents. For example, the regimen recommended by the U.S. Public Health Service is a combination of isoniazid, rifampicin and pyrazinamide for two months, followed by isoniazid and rifampicin alone for a further four months. These drugs are continued for a further seven months in patients infected with HIV. For patients infected with multi-drug resistant strains of M. tuberculosis, agents such as ethambutol, streptomycin, kanamycin, amikacin, capreomycin, ethionamide, cycloserine, ciprofoxacin and ofloxacin are added to the combination therapies. There exists no single agent that is effective in the clinical treatment of tuberculosis, nor any combination of agents that offers the possibility of therapy of less than six months' duration.

There is a high medical need for new drugs that improve current treatment by enabling regimens that facilitate patient and provider compliance. Shorter regimens and those that require less supervision are the best way to achieve this. Most of the benefit from treatment comes in the first 2 months, during the intensive, or bactericidal, phase when four drugs are given together; the bacterial burden is greatly reduced, and patients become noninfectious. The 4- to 6-month continuation, or sterilizing, phase is required to eliminate persisting bacilli and to minimize the risk of relapse. A potent sterilizing drug that shortens treatment to 2 months or less would be extremely beneficial. Drugs that facilitate compliance by requiring less intensive supervision also are needed. Obviously, a compound that reduces both the total length of treatment and the frequency of drug administration would provide the greatest benefit.

Complicating the TB epidemic is the increasing incidence of multi-drug- resistant strains or MDR-TB. Up to four percent of all cases worldwide are considered MDR-TB - those resistant to the most effective drugs of the four-drug standard, isoniazid and rifampin. MDR-TB is lethal when untreated and can not be adequately treated through the standard therapy, so treatment requires up to 2 years of "second-line" drugs. These drugs are often toxic, expensive and marginally effective. In the absence of an effective therapy, infectious MDR-TB patients continue to spread the disease, producing new infections with MDR-TB strains. There is a high medical need for a new drug with a new mechanism of action, which is likely to demonstrate activity against MDR strains.

The purpose of the present invention is to provide novel compounds, in particular substituted quinoline derivatives; having the property of inhibiting growth of mycobacteria and therefore useful for the treatment of mycobacterial diseases, particularly those diseases caused by pathogenic mycobacteria such as Mycobacterium tuberculosis, M bovis, M avium and M. marinum.

Substituted quinolines were already disclosed in US 5,965,572 (The United States of America) for treating antibiotic resistant infections and in WO 00/34265 to inhibit the growth of bacterial microorganisms. None of these publications disclose the substituted quinoline derivatives according to our invention.

The present invention relates to novel substituted quinoline derivatives according to Formula (Ia) or Formula (Ib) the pharmaceutically acceptable acid or base addition salts thereof, the stereochemically isomeric forms thereof, the tautomeric forms thereof and the N-oxide forms thereof, wherein :

R¹

is hydrogen, halo, haloalkyl, cyano, hydroxy, Ar, Het, alkyl, alkyloxy, alkylthio, alkyloxyalkyl, alkylthioalkyl, Ar-alkyl or di(Ar)alkyl ;

p

is an integer equal to zero, 1, 2, 3 or 4 ;

R²

is hydrogen, hydroxy, thio, alkyloxy, alkyloxyalkyloxy, alkylthio, mono or di(alkyl)amino or a radical of formula wherein Y is CH₂, O, S, NH or N-alkyl ;

R³

is alkyl, Ar, Ar-alkyl, Het or Het-alkyl;

q

is an integer equal to zero, 1, 2, 3 or 4 ;

R⁴ and R⁵

each independently are hydrogen, alkyl or benzyl; or

R⁴ and R⁵

together and including the N to which they are attached may form a radical selected from the group of pyrrolidinyl, 2H-pyrrolyl, 2-pyrrolinyl, 3-pyrrolinyl, pyrrolyl, imidazolidinyl, pyrazolidinyl, 2-imidazolinyl, 2-pyrazolinyl, imidazolyl, pyrazolyl, triazolyl, piperidinyl, pyridinyl, piperazinyl, imidazolidinyl, pyridazinyl, pyrimidinyl, pyrazinyl, triazinyl, morpholinyl and thiomorpholinyl, optionally substituted with alkyl, halo, haloalkyl, hydroxy, alkyloxy, amino, mono- or dialkylamino, alkylthio, alkyloxyalkyl, alkylthioalkyl and pyrimidinyl ;

R⁶

is hydrogen, halo, haloalkyl, hydroxy, Ar, alkyl, alkyloxy, alkylthio, alkyloxyalkyl, alkylthioalkyl, Ar-alkyl or di(Ar)alkyl ; or

two vicinal R⁶

radicals may be taken together to form a bivalent radical of formula =C-C=C=C- ;

r

is an integer equal to 0,1, 2, 3, 4 or 5 ; and

R⁷

is hydrogen, alkyl, Ar or Het ;

R⁸

is hydrogen or alkyl ;

R⁹

is oxo ; or

R⁸ and R⁹

together form the radical =N-CH=CH-.

alkyl

is a straight or branched saturated hydrocarbon radical having from 1 to 6 carbon atoms ; or is a cyclic saturated hydrocarbon radical having from 3 to 6 carbon atoms ; or is a a cyclic saturated hydrocarbon radical having from 3 to 6 carbon atoms attached to a straight or branched saturated hydrocarbon radical having from 1 to 6 carbon atoms ; wherein each carbon atom can be optionally substituted with halo, hydroxy, alkyloxy or oxo ;

Ar

is a homocycle selected from the group of phenyl, naphthyl, acenaphthyl, tetrahydronaphthyl, each optionally substituted with 1, 2 or 3 substituents, each substituent independently selected from the group of hydroxy, halo, cyano, nitro, amino, mono- or dialkylamino, alkyl, haloalkyl, alkyloxy, haloalkyloxy, carboxyl, alkyloxycarbonyl, aminocarbonyl, morpholinyl and mono- or dialkylaminocarbonyl ;

Het

is a monocyclic heterocycle selected from the group ofN-phenoxypiperidinyl, pyrrolyl, pyrazolyl, imidazolyl, furanyl, thienyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridinyl, pyrimidinyl, pyrazinyl and pyridazinyl; or a bicyclic heterocycle selected from the group of quinolinyl, quinoxalinyl, indolyl, benzimidazolyl, benzoxazolyl, benzisoxazolyl, benzothiazolyl, benzisothiazolyl, benzofuranyl, benzothienyl, 2,3-dihydrobenzo[1,4]dioxinyl or benzo[1,3]dioxolyl ; each monocyclic and bicyclic heterocycle may optionally be substituted on a carbon atom with 1, 2 or 3 substituents selected from the group of halo, hydroxy, alkyl or alkyloxy ;

halo

is a substituent selected from the group of fluoro, chloro, bromo and iodo and

haloalkyl

is a straight or branched saturated hydrocarbon radical having from 1 to 6 carbon atoms or a cyclic saturated hydrocarbon radical having from 3 to 6 carbon atoms, wherein one or more carbonatoms are substituted with one or more halo-atoms.

The compounds according to Formula (Ia) and (Ib) are interrelated in that e.g. a compound according to Formula (Ib), with R⁹ equal to oxo is the tautomeric equivalent of a compound according to Formula (Ia) with R² equal to hydroxy (keto-enol tautomerism).

In the framework of this application, alkyl is a straight or branched saturated hydrocarbon radical having from 1 to 6 carbon atoms ; or is a cyclic saturated hydrocarbon radical having from 3 to 6 carbon atoms ; or is a a cyclic saturated hydrocarbon radical having from 3 to 6 carbon atoms attached to a straight or branched saturated hydrocarbon radical having from 1 to 6 carbon atoms ; wherein each carbon atom can be optionally substituted with halo, hydroxy, alkyloxy or oxo. Preferably, alkyl is methyl, ethyl or cyclohexylmethyl.

In the framework of this application, Ar is a homocycle selected from the group of phenyl, naphthyl, acenaphthyl, tetrahydronaphthyl, each optionally substituted with 1, 2 or 3 substituents, each substituent independently selected from the group of hydroxy, halo, cyano, nitro, amino, mono- or dialkylamino, alkyl, haloalkyl, alkyloxy, haloalkyloxy, carboxyl, alkyloxycarbonyl, aminocarbonyl, morpholinyl and mono- or dialkylaminocarbonyl. Preferably, Ar is naphthyl or phenyl, each optionally substituted with 1 or 2 halo substituents.

In the framework of this application, Hetis a monocyclic heterocycle selected from the group of N-phenoxypiperidinyl, pyrrolyl, pyrazolyl, imidazolyl, furanyl, thienyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridinyl, pyrimidinyl, pyrazinyl and pyridazinyl; or a bicyclic heterocycle selected from the group of quinolinyl, quinoxalinyl, indolyl, benzimidazolyl, benzoxazolyl, benzisoxazolyl, benzothiazolyl, benzisothiazolyl, benzofuranyl, benzothienyl, 2,3-dihydrobenzo[1,4]dioxinyl or benzo[1,3]dioxolyl ; each monocyclic and bicyclic heterocycle may optionally be substituted on a carbon atom with 1, 2 or 3 substituents selected from the group of halo, hydroxy, alkyl or alkyloxy. Preferably, Het is thienyl.

In the framework of this application, halo is a substituent selected from the group of fluoro, chloro, bromo and iodo and haloalkyl is a straight or branched saturated hydrocarbon radical having from 1 to 6 carbon atoms or a cyclic saturated hydrocarbon radical having from 3 to 6 carbon atoms, wherein one or more carbonatoms are substituted with one or more halo-atoms. Preferably, halo is bromo, fluoro or chloro and preferably, haloalkyl is trifluoromethyl.

Preferably, the invention relates to compounds of Formula (Ia) and (Ib) wherein :

R¹

is hydrogen, halo, cyano, Ar, Het, alkyl, and alkyloxy ;

p

is an integer equal to zero, 1, 2, 3 or 4 ;

R²

is hydrogen, hydroxy, alkyloxy, alkyloxyalkyloxy, alkylthio or a radical of formula wherein Y is O ;

R³

is alkyl, Ar, Ar-alkyl or Het ;

q

is an integer equal to zero, 1, 2, or 3 ;

R⁴ and R⁵

each independently are hydrogen, alkyl or benzyl; or

R⁴ and R⁵

together and including the N to which they are attached may form a radical selected from the group of pyrrolidinyl, imidazolyl, triazolyl, piperidinyl, piperazinyl, pyrazinyl,morpholinyl and thiomorpholinyl, optionally substituted with alkyl and pyrimidinyl ;

R⁶

is hydrogen, halo or alkyl ; or

two vicinal R⁶

radicals may be taken together to form a bivalent radical of formula =C-C=C=C- ;

r

is an integer equal to 1; and

R⁷

is hydrogen ;

R⁸

is hydrogen or alkyl ;

R⁹

is oxo ; or

R⁸ and R⁹

together form the radical =N-CH=CH-.

alkyl

is a straight or branched saturated hydrocarbon radical having from 1 to 6 carbon atoms ; or is a cyclic saturated hydrocarbon radical having from 3 to 6 carbon atoms ; or is a a cyclic saturated hydrocarbon radical having from 3 to 6 carbon atoms attached to a straight or branched saturated hydrocarbon radical having from 1 to 6 carbon atoms ; wherein each carbon atom can be optionally substituted with halo or hydroxy ;

Ar

is a homocycle selected from the group of phenyl, naphthyl, acenaphthyl, tetrahydronaphthyl, each optionally substituted with 1, 2 or 3 substituents, each substituent independently selected from the group of halo, haloalkyl, cyano, alkyloxy and morpholinyl ;

Het

is a monocyclic heterocycle selected from the group of N-phenoxypiperidinyl, furanyl, thienyl, pyridinyl, pyrimidinyl ; or a bicyclic heterocycle selected from the group of benzothienyl, 2,3-dihydrobenzo[1,4]dioxinyl or benzo[1,3]-dioxolyl; each monocyclic and bicyclic heterocycle may optionally be substituted on a carbon atom with 1, 2 or 3 alkyl substituents ; and

halo

is a substituent selected from the group of fluoro, chloro and bromo.

For compounds according to either Formula (Ia) and (Ib), preferably, R¹ is hydrogen, halo, Ar, alkyl or alkyloxy. More preferably, R¹ is halo. Most preferably, R¹ is bromo.

Preferably, p is equal to 1.

Preferably, R² is hydrogen, alkyloxy or alkylthio. More preferably, R² is alkyloxy. Most preferably, R² is methyloxy.

Preferably, R³ is naphthyl, phenyl or thienyl, each optionally substituted with 1 or 2 substituents, that substituent preferably being a halo or haloalkyl, most preferably being a halo. More preferably, R³ is naphthyl or phenyl. Most preferably, R³ is naphthyl.

Preferably, q is equal to zero, 1 or 2. More preferably, q is equal to 1.

Preferably, R⁴ and R⁵ each independently are hydrogen or alkyl, more preferably hydrogen, methyl or ethyl, most preferably methyl.

Preferably R⁴ and R⁵ together and including the N to which they are attached form a radical selected from the group of imidazolyl, triazolyl, piperidinyl, piperazinyl and thiomorpholinyl, optionally substituted with alkyl, halo, haloalkyl, hydroxy, alkyloxy, alkylthio, alkyloxyalkyl or alkylthioalkyl, preferably substituted with alkyl, most preferably substituted with methyl or ethyl.

Preferably, R⁶ is hydrogen, alkyl or halo. Most preferably, R⁶ is hydrogen. Preferably r is 0, 1 or 2.

Preferably, R⁷ is hydrogen or methyl.

For compounds according to Formula (Ib) only, preferably, R⁸ is alkyl, preferably methyl and R⁹ is oxygen.

An interesting group of compounds are those compounds according to Formula (Ia), the pharmaceutically acceptable acid or base addition salts thereof, the stereochemically isomeric forms thereof, the tautomeric forms thereof and the N-oxide forms thereof, in which R¹ is hydrogen, halo, Ar, alkyl or alkyloxy, p = 1, R² is hydrogen, alkyloxy or alkylthio, R³ is naphthyl, phenyl or thienyl, each optionally substituted with 1 or 2 substituents selected from the group of halo and haloalkyl, q = 0,1,2 or 3, R⁴ and R⁵ each independently are hydrogen or alkyl or R⁴ and R⁵ together and including the N to which they are attached form a radical selected from the group of imidazolyl, triazolyl, piperidinyl, piperazinyl and thiomorpholinyl, R⁶ is hydrogen, alkyl or halo, r is equal to 0 or 1 and R⁷ is hydrogen.

Most preferable, the compound is :

• o 1-(6-bromo-2-methoxy-quinolin-3-yl)-2-(3,5-difluoro-phenyl)-4-dimethylamino-1-phenyl-butan-2-ol ;
• o 1-(6-bromo-2-methoxy-quinolin-3-yl)-4-dimethylamino-2-naphthalen-1-yl-1-phenyl-butan-2-ol ;
• o 1-(6-bromo-2-methoxy-quinolin-3-yl)-2-(2,5-difluoro-phenyl)-4-dimethylamino-1-phenyl-butan-2-ol ;
• o 1-(6-bromo-2-methoxy-quinolin-3-yl)-2-(2,3-difluoro-phenyl)-4-dimethylamino-1-phenyl-butan-2-ol ;
• o 1-(6-bromo-2-methoxy-quinolin-3-yl)-4-dimethylamino-2-(2-fluoro-phenyl)-1-phenyl-butan-2-ol ;
• o 1-(6-bromo-2-methoxy-quinolin-3-yl)-4-dimethylamino-2-naphthalen-1-yl-1-p-tolyl-butan-2-ol ;
• o 1-(6-bromo-2-methoxy-quinolin-3-yl)-4-methylamino-2-naphthalen-1-yl-1-phenyl-butan-2-ol ; and
• o 1-(6-bromo-2-methoxy-quinolin-3-yl)-4-dimethylamino-2-(3-fluoro-phenyl)-1-phenyl-butan-2-ol,

The pharmaceutically acceptable acid addition salts are defined to comprise the therapeutically active non-toxic acid addition salt forms which the compounds according to either Formula (Ia) and (Ib) are able to form. Said acid addition salts can be obtained by treating the base form of the compounds according to either Formula (Ia) and (Ib) with appropriate acids, for example inorganic acids, for example hydrohalic acid, in particular hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid and phosphoric acid ; organic acids, for example acetic acid, hydroxyacetic acid, propanoic acid, lactic acid, nyruvic acid, oxalic acid, malonic acid, succinic acid, maleic acid, fumaric acid, malic acid, tartaric acid, citric acid, methanesulfonic acid, ethanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, cyclamic acid, salicyclic acid, p-aminosalicylic acid and pamoic acid.

The compounds according to either Formula (Ia) and (Ib) containing acidic protons may also be converted into their therapeutically active non-toxic base addition salt forms by treatment with appropriate organic and inorganic bases. Appropriate base salts forms comprise, for example, the ammonium salts, the alkaline and earth alkaline metal salts, in particular lithium, sodium, potassium, magnesium and calcium salts, salts with organic bases, e.g. the benzathine, N-methyl-D-glucamine, hybramine salts, and salts with amino acids, for example arginine and lysine.

Conversely, said acid or base addition salt forms can be converted into the free forms by treatment with an appropriate base or acid.

The term addition salt as used in the framework of this application also comprises the solvates which the compounds according to either Formula (Ia) and (Ib) as well as the salts thereof, are able to form. Such solvates are, for example, hydrates and alcoholates.

The term "stereochemically isomeric forms" as used herein defines all possible isomeric forms which the compounds of either Formula (Ia) and (Ib) may possess. Unless otherwise mentioned or indicated, the chemical designation of compounds denotes the mixture of all possible stereochemically isomeric forms, said mixtures containing all diastereomers and enantiomers of the basic molecular structure. More in particular, stereogenic centers may have the R- or S-configuration; substituents on bivalent cyclic (partially) saturated radicals may have either the cis- or trans-configuration. Stereochemically isomeric forms of the compounds of either Formula (Ia) and (Ib) are obviously intended to be embraced within the scope of this invention.

Following CAS-nomenclature conventions, when two stereogenic centers of known absolute configuration are present in a molecule, an R or S descriptor is assigned (based on Cahn-Ingold-Prelog sequence rule) to the lowest-numbered chiral center, the reference center. The configuration of the second stereogenic center is indicated using relative descriptors [R*,R* ] or [R*,S*], where R* is always specified as the reference center and [R*,R*] indicates centers with the same chirality and [R*,S*] indicates centers of unlike chirality. For example, if the lowest-numbered chiral center in the molecule has an S configuration and the second center is R, the stereo descriptor would be specified as S-[R*,S*]. If "α" and "β" are used : the position of the highest priority substituent on the asymmetric carbon atom in the ring system having the lowest ring number, is arbitrarily always in the "α" position of the mean plane determined by the ring system. The position of the highest priority substituent on the other asymmetric carbon atom in the ring system relative to the position of the highest priority substituent on the reference atom is denominated "a", if it is on the same side of the mean plane determined by the ring system, or "β", if it is on the other side of the mean plane determined by the ring system.

Compounds of either Formula (Ia) and (Ib) and some of the intermediate compounds invariably have at least two stereogenic centers in their structure which may lead to at least 4 stereochemically different structures.

The tautomeric forms of the compounds of either Formula (Ia) and (Ib) are meant to comprise those compounds of either Formula (Ia) and (Ib) wherein e.g. an enol group is converted into a keto group (keto-enol tautomerism).

The N-oxide forms of the compounds according to either Formula (Ia) and (Ib) are meant to comprise those compounds of either Formula (Ia) and (Ib) wherein one or several nitrogen atoms are oxidized to the so-called N-oxide, particularly those N-oxides wherein the nitrogen of the amine radical is oxidized.

The compounds of either Formula (Ia) and (Ib) as prepared in the processes described below may be synthesized in the form of racemic mixtures of enantiomers which can be separated from one another following art-known resolution procedures. The racemic compounds of either Formula (Ia) and (Ib) may be converted into the corresponding diastereomeric salt forms by reaction with a suitable chiral acid. Said diastereomeric salt forms are subsequently separated, for example, by selective or fractional crystallization and the enantiomers are liberated therefrom by alkali. An alternative manner of separating the enantiomeric forms of the compounds of either Formula (Ia) and (Ib) involves liquid chromatography using a chiral stationary phase. Said pure stereochemically isomeric forms may also be derived from the corresponding pure stereochemically isomeric forms of the appropriate starting materials, provided that the reaction occurs stereospecifically. Preferably if a specific stereoisomer is desired, said compound will be synthesized by stereospecific methods of preparation. These methods will advantageously employ enantiomerically pure starting materials.

Derivative compounds, b, usually called "pro-drugs" of the pharmacologically-active compounds according to the invention are degraded in vivo to yield the compounds according to the invention. Pro-drugs are usually (but not always) of lower potency at the target receptor than the compounds to which they are degraded. Pro-drugs are particularly useful when the desired compound has chemical or physical properties that make its administration difficult or inefficient. For example, the desired compound may be only poorly soluble, it may be poorly transported across the mucosal epithelium, or it may have an undesirably short plasma half-life. Further discussion on pro-drugs may be found in Stella, V. J. et al., "Prodrugs", Drug Delivery Systems, 1985, pp. 112-176, and Drugs, 1985, 29, pp. 455-473.

Pro-drugs forms of the pharmacologically-active compounds according to the invention will generally be compounds according to either Formula (Ia) and (Ib), the pharmaceutically acceptable acid or base addition salts thereof, the stereochemically isomeric forms thereof, the tautomeric forms thereof and the N-oxide forms thereof, having an acid group which is esterified or amidated. Included in such esterified acid groups are groups of the formula -COOR^x, where R^x is a C_1-6alkyl, phenyl, benzyl or one of the following groups :

Amidated groups include groups of the formula - CONR^yR^z, wherein R^y is H, C_1-6alkyl, phenyl or benzyl and R^z is -OH, H, C_1-6alkyl, phenyl or benzyl.

Compounds according to the invention having an amino group may be derivatised with a ketone or an aldehyde such as formaldehyde to form a Mannich base. This base will hydrolyze with first order kinetics in aqueous solution.

The compounds according to the invention have surprisingly been shown to be suitable for the treatment of mycobacterial diseases, particularly those diseases caused by pathogenic mycobacteria such as Mycobacterium tuberculosis, M. bovis, M. avium and M. marinum. The present invention thus also relates to compounds of either Formula (Ia) and (Ib) as defined hereinabove, the pharmaceutically acceptable acid or base addition salts thereof, the stereochemically isomeric forms thereof, the tautomeric forms thereof and the N-oxide forms thereof, for use as a medicine.

The invention also relates to a composition comprising a pharmaceutically acceptable carrier and, as active ingredient, a therapeutically effective amount of a compound according to the invention. The compounds according to the invention may be formulated into various pharmaceutical forms for administration purposes. As appropriate compositions there may be cited all compositions usually employed for systemically administering drugs. To prepare the pharmaceutical compositions of this invention, an effective amount of the particular compound, optionally in addition salt form, as the active ingredient is combined in intimate admixture with a pharmaceutically acceptable carrier, which carrier may take a wide variety of forms depending on the form of preparation desired for administration. These pharmaceutical compositions are desirable in unitary dosage form suitable, in particular, for administration orally or by parenteral injection. For example, in preparing the compositions in oral dosage form, any of the usual pharmaceutical media may be employed such as, for example, water, glycols, oils, alcohols and the like in the case of oral liquid preparations such as suspensions, syrups, elixirs, emulsions and solutions; or solid carriers such as starches, sugars, kaolin, diluents, lubricants, binders, disintegrating agents and the like in the case of powders, pills, capsules and tablets. Because of their ease in administration, tablets and capsules represent the most advantageous oral dosage unit forms in which case solid pharmaceutical carriers are obviously employed. For parenteral compositions, the carrier will usually comprise sterile water, at least in large part, though other ingredients, for example, to aid solubility, may be included. Injectable solutions, for example, may be prepared in which the carrier comprises saline solution, glucose solution or a mixture of saline and glucose solution. Injectable suspensions may also be prepared in which case appropriate liquid carriers, suspending agents and the like may be employed. Also included are solid form preparations which are intended to be converted, shortly before use, to liquid form preparations.

Depending on the mode of administration, the pharmaceutical composition will preferably comprise from 0.05 to 99 % by weight, more preferably from 0.1 to 70 % by weight of the active ingredient, and, from 1 to 99.95 % by weight, more preferably from 30 to 99.9 weight % of a pharmaceutically acceptable carrier, all percentages being based on the total composition.

The pharmaceutical composition may additionally contain various other ingredients known in the art, for example, a lubricant, stabilising agent, buffering agent, emulsifying agent, viscosity-regulating agent, surfactant, preservative, flavouring or colorant.

It is especially advantageous to formulate the aforementioned pharmaceutical compositions in unit dosage form for ease of administration and uniformity of dosage. Unit dosage form as used herein refers to physically discrete units suitable as unitary dosages, each unit containing a predetermined quantity of active ingredient calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier. Examples of such unit dosage forms are tablets (including scored or coated tablets), capsules, pills, powder packets, wafers, suppositories, injectable solutions or suspensions and the like, and segregated multiples thereof. The daily dosage of the compound according to the invention will, of course, vary with the compound employed, the mode of administration, the treatment desired and the mycobacterial disease indicated. However, in general, satisfactory results will be obtained when the compound according to the invention is administered at a daily dosage not exceeding 1 gram, e.g. in the range from 10 to 50 mg/kg body weight.

Further, the present invention also relates to the use of a compound of either Formula (Ia) and (Ib), the pharmaceutically acceptable acid or base addition salts thereof, the stereochemically isomeric forms thereof, the tautomeric forms thereof and the N-oxide forms thereof, as well as any of the aforementioned pharmaceutical compositions thereof for the manufacture of a medicament for the treatment of mycobacterial diseases.

The compounds according to the invention can generally be prepared by a succession of steps, each of which is known to the skilled person.

In particular, the compounds according to Formula (Ia) can be prepared by reacting an intermediate compound of Formula (II) with an intermediate compound of Formula (III) according to the following reaction scheme (1) : using BuLi in a mixture of DIPA and THF, wherein all variables are defined as in Formula (Ia). Stirring may enhance the rate of the reaction. The reaction may conveniently be carried out at a temperature ranging between -20 and -70 °C.

The starting materials and the intermediate compounds of Formula (II) and (III) are compounds that are either commercially available or may be prepared according to conventional reaction procedures generally known in the art. For example, intermediate compounds of Formula (II-a) may be prepared according to the following reaction scheme (2): wherein all variables are defined as in Formula (Ia) and (Ib). Reaction scheme (2) comprises step (a) in which an appropriately substituted aniline is reacted with an appropriate acylchloride such as 3-phenylpropionyl chloride, 3-fluorobenzenepropionyl chloride or p-chlorobenzenepropionyl chloride, in the presence of a suitable base, such as triethylamine and a suitable reaction-inert solvent, such as methylene chloride or ethylene dichloride. The reaction may conveniently be carried out at a temperature ranging between room temperature and reflux temperature. In a next step (b) the adduct obtained in step (a) is reacted with phosphoryl chloride (POCl₃) in the presence of N,N-dimethylformamide (Vilsmeier-Haack formylation followed by cyclization). The reaction may conveniently be carried out at a temperature ranging between room temperature and reflux temperature. In a next step (c) a specific R³-group, wherein R³ is an alkyloxy or alkylthio radical is introduced by reacting the intermediate compound obtained in step (b) with a compound X-Alk, wherein X=S or O and Alk is an alkylgroup as defined in Formula (Ia) and (Ib).

Intermediate compounds according to Formula (II-b) may be prepared according to the following reaction scheme (3), wherein in a first step (a) a substituted indole-2,3-dione is reacted with a substituted 3-phenylpropionaldehyde in the presence of a suitable base such as sodium hydroxide (Pfitzinger reaction), after which the carboxylic acid compound in a next step (b) is decarboxylated at high temperature in the presence of a suitable reaction-inert solvent usch as diphenylether.

It is evident that in the foregoing and in the following reactions, the reaction products may be isolated from the reaction medium and, if necessary, further purified according to methodologies generally known in the art, such as extraction, crystallization and chromatography. It is further evident that reaction products that exist in more than one enantiomeric form, may be isolated from their mixture by known techniques, in particular preparative chromatography, such as preparative HPLC. Typically, compounds of Formula (Ia) and (Ib) may be separated into their isomeric forms.

The intermediate compounds of Formula (III) are compounds that are either commercially available or may be prepared according to conventional reaction procedures generally known in the art. For example, intermediate compounds of Formula (III-a) in which R³ is Ar substituted with s substituents R¹⁰, wherein each R¹⁰ is independently selected from the group of hydroxy, halo, cyano, nitro, amino, mono- or dialkylamino, alkyl, haloalkyl, alkyloxy, haloalkyloxy, carboxyl, alkyloxycarbonyl, aminocarbonyl, morpholinyl and mono- or dialkylaminocarbonyl ans s is an integer equal to zero, 1, 2 or 3, may be prepared according to the following reaction scheme (4):

Reaction scheme (4) comprises step (a) in which an appropriately substituted phenyl is reacted by Friedel-Craft reaction with an appropriate acylchloride such as 3-chloropropionyl chloride or 4-chlorobutyryl chloride, in the presence of a suitable Lewis acid, such as AlCl₃, FeCl₃, SnCl₄, TiCl₄ or ZnCl₂ and a suitable reaction-inert solvent, such as methylene chloride or ethylene dichloride. The reaction may conveniently be carried out at a temperature ranging between room temperature and reflux temperature. In a next step (b) an amino group (-NR₄R₅) is introduced by reacting the intermediate compound obtained in step (a) with a primary or secondary amine.

The following examples illustrate the present invention.

Of some compounds the absolute stereochemical configuration of the stereogenic carbon atom(s) therein was not experimentally determined. In those cases the stereochemically isomeric form which was first isolated is designated as "A" and the second as "B", without further reference to the actual stereochemical configuration. However, said "A" and "B" isomeric forms can be unambiguously characterized by a person skilled in the art, using art-known methods such as, for example, X-ray diffraction. The isolation method is described in detail below.

Hereinafter, "DMF" is defined as N,N-dimethylformamide, "DIPE" is defined as diisopropyl ether, "THF" is defined as tetrahydrofuran.

Benzenepropanoylchloride (0.488 mol) was added dropwise at room temperature to a solution of 4-bromobenzenamine (0.407 mol) in Et₃N (70ml) and CH₂Cl₂ (700ml) and the mixture was stirred at room temperature overnight. The mixture was poured out into water and concentrated NH₄OH, and extracted with CH₂Cl₂. The organic layer was dried (MgSO₄), filtered, and the solvent was evaporated. The residue was crystallized from diethyl ether. The residue (119.67g) was taken up in CH₂Cl₂ and washed with HCl 1N . The organic layer was dried (MgSO₄), filtered, and the solvent was evaporated. Yielding: 107.67g of intermediate compound 1.

Accordingly, intermediate compound 9 was prepared in the same way as intermediate compound 1 but using 4-methyl-benzenepropanoylchloride.

The reaction was carried out twice. POCl₃ (1.225 mol) was added dropwise at 10°C to DMF (0.525 mol). Then intermediate compound 1 (prepared according A1) (0.175 mol) was added at room temperature. The mixture was stirred overnight at 80°C, poured out on ice and extracted with CH₂Cl₂. The organic layer was dried (MgSO₄), filtered, and the solvent was evaporated . The product was used without further purification. Yielding: (77.62g; Yield=67%) .

Accordingly, intermediate compound 10 was prepared in the same way as intermediate compound 2, starting from intermediate compound 9 (prepared according to A1).

A mixture of intermediate compound 2 (prepared according to A2) (0.233 mol) in CH₃ONa (30%) in methanol (222.32 ml) and methanol (776ml) was stirred and refluxed overnight, then poured out on ice and extracted with CH₂Cl₂. The organic layer was separated, dried (MgSO₄), filtered and the solvent was evaporated. The residue was purified by column chromatography over silica gel (eluent: CH₂Cl₂/cyclohexane 20/80 and then 100/0; 20-45µm). The pure fractions were collected and the solvent was evaporated. Yielding: 25g of intermediate compound 3 (Yield=33%; mp.84°C) as a white powder.

Accordingly, intermediate compound 11 was prepared in the same way as intermediate compound 3, starting from intermediate compound 10 (prepared according to A2).

A mixture of intermediate compound 2 (prepared according to A2) (0.045 mol) in NaOEt 21% in ethanol (50ml) and ethanol (150ml) was stirred and refluxed for 12 hours. The mixture was poured out on ice and extracted with CH₂Cl₂. The organic layer was separated, dried (MgSO₄), filtered and the solvent was evaporated. Yielding: 15.2g of intermediate compound 4 (98%).

A mixture of 5-bromo-1H-indole-2,3-dione (0.28 mol) in NaOH 3N (650ml) was stirred and heated at 80°C for 30 min, then cooled to room temperature. Benzenepropanal (0.28 mol) was added and the mixture was stirred and refluxed overnight. The mixture was allowed to cool to room temperature and acidified till pH=5 with HOAc . The precipitate was filtered off, washed with H₂O and dried (vacuum). Yielding: 50g of intermediate compound 5 (52%).

A mixture of intermediate compound 5 (prepared according to A5) (0.035 mol) in diphenylether (100ml) was stirred and heated at 300°C for 8 hours, then allowed to cool to room temperature. This procedure was carried out four times. The four mixtures were combined and then purified by column chromatography over silica gel (eluent: CH₂Cl₂/CH₃OH 100/0, then 99/1). The pure fractions were collected and the solvent was evaporated. Yielding: 25.6g of intermediate compound 6 (61%).

nBuLi 1.6M (0.13 mol) was added dropwise at -10°C under N₂ flow to a mixture of N-(1-methylethyl)-2-propanamine (0.13 mol) in THF (300ml). The mixture was stirred at -10°C for 20 min and then cooled to -70°C . A solution of intermediate compound 3 (prepared according to A3) (0.1 mol) in THF (300ml) was added dropwise. The mixture was stirred at -70°C for 45 min. A solution of 2-(3-oxo-3-phenylpropyl)-1H-isoindole-1,3(2H)-dione (0.13 mol) in THF (300ml) was added dropwise. The mixture was stirred at -70°C for 1 hour, then brought to -40°C, stirred at -40°C for 2 hours, hydrolyzed at -40°C with H₂O and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered and the solvent was evaporated. The residue (40g) was purified by column chromatography over silica gel (eluent: cyclohexane/EtOAc 85/15). Two pure fractions were collected and their solvents were evaporated. Yielding: 1.8g of intermediate compound 7 (3%) and 5.3g of intermediate compound 8 (9%).

A mixture of aluminium chloride (34.3g, 0.257mol) and 3-chloropropionyl chloride (29.7g, 0.234mol) in dichloroethane (150ml) was stirred at 0°C. A solution of naphtalene (30g, 0.234mol) in dichloroethane (50ml) was added. The mixture was stirred at 5°C for 2 hours and poured out into ice water. The organic layer was separated, dried (MgSO₄), filtered, and the solvent was evaporated. The residue (56g) was purified by column chromatography over silica gel (eluent: cyclohexane/ CH₂Cl₂: 60/40; 20-45µm). Two fractions were collected and the solvent was evaporated to afford intermediate compound 12 (31g; Yield=61%) as an oil. The second fraction (14g) was taken up in DIPE to afford intermediate compound 13 (8.2g; Yield=16%; mp.68°C) as a pale yellow solid.

A mixture of the intermediate compound 12 (prepared according to A8) (3g; 0.0137mol), N-benzylmethyl amine (2ml; 0.0150mol) in acetonitrile (100ml) was stirred at 80°C for 2 hours. At room temperature (RT) water was added. The mixture was extracted with CH₂Cl₂. The organic layer was separated and dried (MgSO₄), filtered, and the solvent was evaporated. The residue (6g) was purified by column chromatography over silica gel (eluent: CH₂Cl₂/MeOH: 97/3; 20-45µm) to afford BB1 (4.2g; quantitative yield) as an oil, yielding intermediate compound 14.

A mixture of 3,5-difluoroacetophenone (commercially available) (25g;0.16mol), diethylamine hydrochloride (52g; 0.64mol), paraformaldehyde (19g; 0.63mol) in HCl conc (5ml) and ethanol (300ml) was stirred at 80°C for 16hours.The mixture was evaporated till dryness and the residue was taken up by HCl 3N (50ml). This mixture was extracted with Et₂O (3x30ml). The organic layer was collected and basified with K₂CO₃ (10%aq). The organic layer was dried over MgSO₄ and evaporated. The product, intermediate compound 15 was used without further purification for the next step (23.7g; yield: 69%) as an oil.

nBuLi 1.6M (0.067 mol) was added slowly at -20°C under N₂ flow to a solution of N-(1-methylethyl)-2-propanamine (0.067 mol) in THF (100ml). The mixture was cooled to -70°C. A solution of intermediate compound 3 (prepared according to A3) (0.122 mol) in THF (200ml) was added slowly. The mixture was stirred at -70°C for 30 min. A solution of 3-(dimethylamino)-1-phenyl-1-propanone (0.146 mol) in THF (100ml) was added slowly. The mixture was stirred at -70°C for 1 hour, then hydrolysed at -30°C with ice water and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered and the solvent was evaporated. The residue (67g) was purified by column chromatography over silica gel (eluent: CH₂Cl₂/CH₃OH/NH₄OH 99/1/0.1; 20-45µm). Two pure fractions were collected and their solvents were evaporated. Fraction 1 (7,2g) was crystallized from DIPE. The precipitate was filtered off and dried. Yielding: 6.5g of diastereoisomer A (final compound 3) (mp. 172°C) (10%) as a white solid. Fraction 2 (13g) was crystallized from 2-propanone and diethyl ether. The precipitate was filtered off and dried. Yielding: 11g of diastereoisomer B (final compound 4) (mp.170°C) (17%) as a white solid. Part of fraction of final compound 3 (4g) was separated into its enantiomers by column chromatography (eluent: hexane/2-propanol 99.9/0.1; column: CHIRACEL OD). Two pure fractions were collected and their solvents were evaporated. The residue was crystallized from pentane. The precipitate was filtered off and dried. Yielding: 0.7g of enantiomer A1 (final compound 1) (mp. 194°C) and 0.6g of enantiomer A2 (final compound 2) (mp. 191°C) as a white solid.

nBuLi 1.6M (0.048 mol) was added slowly at -20°C to a solution of N-(1-methylethyl)-2-propanamine (0.048 mol) in THF (70ml). The mixture was cooled again to -70°C. A solution of intermediate compound 4 (prepared according to A4) (0.044 mol) in THF (150ml) was added slowly. The mixture was stirred at -70°C for 30 min. A solution of 3-(dimethylamino)-1-phenyl-1-propanone (0.053 mol) in THF (100ml) was added slowly. The mixture was stirred at -70°C for 1 hour, hydrolysed at -30°C with ice water and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered and the solvent was evaporated. The residue (23.5g) was purified by column chromatography over silica gel (eluent: CH₂Cl₂/CH₃OH/NH₄OH 99.5/0.5/0.1; 15-40 µm). Two pure fractions were collected and their solvents were evaporated. The residue was crystallized from DIPE. The precipitate was filtered off and dried. Yielding: 0.7g of final compound 5 (3%) (mp. 162°C) as a white solid and 1g of final compound 6 (5%) (mp. 74°C) as a white solid.

nBuLi (1.6M) (0.070 mol) was added dropwise at -30°C under N₂ flow to a solution of N-(1-methylethyl)-2-propanamine (0.070 mol) in THF (70ml). The mixture was stirred at -20°C for 30 min, then cooled to -70°C. A solution of intermediate compound 6 (prepared according to A6) (0.046 mol) in THF (130ml) was added dropwise. The mixture was stirred at -70°C for 45 min. A solution of 3-(dimethylamino)-1-phenyl-1-propanone (0.056 mol) in THF (100ml) was added dropwise. The mixture was stirred at -70°C for 2 hours, hydrolyzed with ice-water and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered and the solvent was evaporated. The residue (23.6g) was purified by column chromatography over silica gel (eluent: CH₂Cl₂/CH₃OH/NH₄OH 99/1/0.1; 15-40 µm). Two pure fractions were collected and their solvents were evaporated. Fraction 1 (4g) was crystallized from diethyl ether. The precipitate was filtered off and dried. Yielding: 1.7g of final compound 7 (mp. 98°C) (7.6%). Fraction 2 (3.5g) was crystallized from dietyl ether/EtOAc . The precipitate was filtered off and dried. Yielding: 2.2g of final compound 8 (mp. 180°C) (9.8%) as a white solid.

A mixture of intermediate compound 8 (prepared according to A7) (0.009 mol) and hydrazine (0.01 mol) in ethanol (70ml) was stirred and refluxed for 1 hour. The solvent was evaporated till dryness. The residue was dissolved in CH₂Cl₂. The organic solution was washed with K₂CO₃ 10%, dried (MgSO₄), filtered and the solvent was evaporated. The residue (5g) was purified by column chromatography over silica gel (eluent: CH₂Cl₂/CH₃OH/NH₄OH 97/3/0.1; 15-40 µm). The pure fractions were collected and the solvent was evaporated. The residue was crystallized from diethyl ether. The precipitate was filtered off and dried. Yielding: 2.6g of final compound 9 (mp. 204°C) (62%) as a pale yellow solid.

CH₃I (0.0033 mol) was added at room temperature to a solution of final compound 4 (prepared according to B1) (0.003 mol) in 2-propanone (15ml). The precipitate was filtered off and dried. Yielding: 1.2g of final compound 10 (mp. 198°C) (62%) as a pale yellow solid.

A solution of 3-chloroperoxybenzoic acid (0.0069 mol) in CH₂Cl₂ (35ml) was added dropwise at room temperature to a solution of final compound 4 (prepared according to B1) (0.0069 mol) in CH₂Cl₂ (35ml). The mixture was stirred at room temperature for 1 hour, washed with K₂CO₃ 10%, dried (MgSO₄), filtered and the solvent was evaporated. The residue was crystallized from diethyl ether. The precipitate was filtered off and dried. Yielding: 1.8g of final compound 11 (mp. 208°C) as a white solid.

nBuLi 1.6M (0.05 mol) was added slowly at -20°C under N2 flow to a solution of N-(1-methylethyl)-2-propanamine (0.05 mol) in THF (80ml). The mixture was stirred at - 20°C for 15 minutes, then cooled to -70°C. A solution of intermediate compound 3 (prepared according to A3) (0.046 mol) in THF (150ml) was added slowly. The mixture was stirred at -70°C for 30 minutes. A solution of 0.055 mol of 3-(dimethylamino)-1-(1-naphthyl)-1-propanone in THF (120ml) was added slowly. The mixture was stirred at -70°C for 3 hours, hydrolyzed at -30°C with ice water and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered, and the solvent was evaporated. The residue (29g) was purified by column chromatography over silica gel (eluent: CH₂Cl₂/CH₃OH/NH₄OH; 99.5/0.5/0.1; 15-35µm). Two fractions were collected and the solvent was evaporated. Yielding: 3g fraction 1 and 4.4g of fraction 2 . Fraction 1 and 2 were crystallized separately from DIPE. The precipitate was filtered off and dried, yielding: 2.2g of diastereoisomer A final compound 14 (Yield: 9%; mp.210°C) as a white solid and 4g of diastereoisomer B final compound 15 (Yield: 16%; mp.244°C) as a white solid. To obtain the corresponding enantiomers, diastereoisomer A (final compound 14) was purified by chiral chromatography over silica gel (eluent: hexane//EtOH; 99.95/0.05).Two fractions were collected and the solvent was evaporated. Yielding: 0.233g of enantiomer A1 (final compound 12) (mp. 118°C) as a white solid and 0.287g of enantiomer A2 (final compound 13) (mp. 120°C) as a white solid.

nBuLi 1.6M (0.067 mol) was added slowly at -20°C under N₂ flow to a solution of N-(1-methylethyl)-2-propanamine (0.0104 mol) in THF (50ml).The mixture was cooled to -70°C. A solution of intermediate compound 3 (prepared according to A3) (0.0087 mol) in THF (50ml) was added slowly. The mixture was stirred at -70°C for 30 min. A solution of 3-(dimethylamino)-1-(2,5-difluorophenyl)-1-propanone (0.0122 mol) in THF (20ml) was added slowly. The mixture was stirred at -70°C for 1 hour, then hydrolysed at -30°C with ice water and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered off and the solvent was evaporated. The residue (6.3g) was purified by column chromatography over silica gel (eluent: CH₂Cl₂/CH₃OH/NH₄OH 98/2/0.2; 20-45µm). Two pure fractions were collected and their solvents were evaporated. Fraction 1 (1,2g) was crystallized from Et₂O. The precipitate was filtered off and dried. Yield: 0.63g of diastereoisomer A (final compound 67)(mp. 60°C; Y=13%) as a white solid. Fraction 2 (1g) was crystallized from diethylether. The precipitate was filtered off and dried. Yield: 0.64g of diastereoisomer B (final compound 68) (mp.208°C; Y=14%). 0.63g of diastereoisomer A were purified by chiracel AD (eluent: heptane/iPrOH 99.95/0.05). Two fractions were collected corresponding to A1 enantiomer (final compound 110, 0.13g; mp 167°C) as a white solid and the A2 enantiomer (final compound 111, 0.086g) as an oil.

nBuLi 1.6M (0.04 mol) was added slowly at -20°C under N₂ flow to a solution of N-(1-methylethyl)-2-propanamine (0.04 mol) in THF (50ml). The mixture was cooled to -70°C. A solution of intermediate compound 3 (prepared according to A3) (0.037 mol) in THF (100ml) was added slowly. The mixture was stirred at -70°C for 30 min A solution of 3-(dimethylamino)-1-(3-fluorophenyl)-1-propanone (0.044 mol) in THF (50ml) was added slowly. The mixture was stirred at -70°C for 1 hour, then hydrolized at -30°C with ice water and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered and the solvent was evaporated. The residue (20g) was purified by column chromatography over silica gel (eluent: CH₂Cl₂/CH₃OH/NH₄OH 99.5/0.5/0.1; 15-40µm). Three pure fractions were collected and their solvents were evaporated. Fraction 1 (2.8g) was crystallized from DIPE. The precipitate was filtered off and dried. Yielding: 1.45g (7%) of diastereoisomer A (final compound 38) (mp.198°C) as a white solid. Fraction 2 (3.4g) was crystallized from DIPE. The precipitate was filtered off and dried. Yielding: 1.55g (8%) of diastereoisomer B (final compound 39) (mp.207°C) as a white solid. Part of fraction of final compound 38 (1g) was separated into its enantiomers by chiral chromatography (eluent: hexane/2-propanol 99.9/0.1; column: CHIRACEL OD). Two pure fractions were collected and their solvents were evaporated. The residue was crystallized from pentane. The precipitate was filtered off and dried. Yield: 0.3g of enantiomer A1 (final compound 108) (mp. 160°C) as a white solid and 0.26g of enantiomer A2 (final compound 109) (mp. 156°C) as a white solid.

nBuLi 1.6M (0.0042 mol) was added slowly at -20°C under N₂ flow to a solution of N-(1-methylethyl)-2-propanamine (0.0042mol) in THF (20ml). The mixture was cooled to -70°C. A solution of intermediate compound 9 (prepared according to A1) (0.0038 mol) in THF (50ml) was added slowly. The mixture was stirred at -70°C for 30 min. A solution of 3-(dimethylamino)-1-(1-naphthyl)-1-propanone (0.0059 mol) in THF (20ml) was added slowly. The mixture was stirred at -70°C for 1 hour, then hydrolysed at -30°C with ice water and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered and the solvent was evaporated. The residue (2.2g) was purified by column chromatography over silica gel (eluent: CH₂Cl₂/CH₃OH/NH₄OH 99/1/0.1; 15-40µm). Two pure fractions were collected and their solvents were evaporated. Fraction 1 (0.17g) was crystallized from Et₂O. The precipitate was filtered off and dried. Yield: 0.05g of diastereoisomer A (final compound 71)(mp.174°C; Yield= 3%) as a white solid. Fraction 2 (0.27g) was crystallized from diethyl ether. The precipitate was filtered off and dried. Yield: 0.053g of diastereoisomer B (final compound 72) (mp.178°C; Yield=4%) as a white solid.

A solution of 3-chloroperoxybenzoic acid (0.0036 mol) in CH₂Cl₂ (10ml) was added dropwise at room temperature to a solution of final compound 12 (enantiomer A1) (prepared according to B7) (0.0069 mol) in CH₂Cl₂(35ml). The mixture was stirred at room temperature for 1 hour, washed with K₂CO₃ 10%, dried (MgSO₄), filtered and the solvent was evaporated. The residue was crystallized from diethyl ether. The precipitate was filtered off and dried. Yielding: 0.16g final compound 99 (mp. 218°C; Y=78%) as a white solid.

nBuLi 1.6M (0.0075 mol) was added slowly at -20°C under N₂ flow to a solution of N-(1-methylethyl)-2-propanamine (0.0075 mol) in THF (30ml).The mixture was cooled to -70°C. A solution of intermediate compound 3 (prepared according to A3) (0.0062 mol) in THF (20ml) was added slowly. The mixture was stirred at -70°C for 30 min. A solution of 0.0075 mol of intermediate compound 14 (prepared according to Example A9) in THF (10ml) was added slowly. The mixture was stirred at -70°C for 90 minutes, then hydrolysed at -30°C with ice water and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered and the solvent was evaporated. The residue (3g) was purified by column chromatography over silica gel (eluent: Cyclohexane/EtOAc 90/10; 15-40µm). The final compound 110 (1.5g ; Yield=38%) was obtained as an oil.

1-chloroethyl chloroformate (0.25ml, 0.0023mol) was added at room temperature under nitrogen to a solution of the derived 111 (1.5gr, 0.0023mol) in dichloromethane (30ml). The mixture was stirred at 80°C for 1 hour. The solvent was evaporated and the methanol (15ml) was added. The mixture was stirred and refluxed for 30 minutes. After evaporation, the residue (1.49gr) was purified by column chromatography over silica gel (15-40µm). The first fraction collected was crystallized from DIPE to afford (0.168gr; mp. 204°C; Yield=13%) final compound 111 as the A diastereoisomer. The second fraction collected was corresponded to final compound 112 as the B diastereoisomer (0.298g; mp.225°C; Yield=23%).

nBuLi 1.6M (3.5ml; 0.0056 mol) was added slowly at -20°C under N₂ flow to a solution of N-(1-methylethyl)-2-propanamine (770µl; 0.0055 mol) in THF (20ml). The mixture was cooled to -70°C. A solution of intermediate compound 3 (prepared according to A3) (1.5g; 0.0047 mol) in THF (20ml) was added slowly. The mixture was stirred at -70°C for 30 min . A solution of intermediate compound 15 (1g; 0.0047 mol) in THF (10ml) was added slowly. The mixture was stirred at -70°C for 3 hours, then hydrolysed at -30°C with ice water and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered off and the solvent was evaporated. The residue (2.8g) was purified by column chromatography over silica gel (eluent: CH₂Cl₂/CH₃OH/NH₄OH 99/1/0.1; 15-40µm). Two pure fractions were collected and their solvents were evaporated. Fraction 1 (0.149g) was crystallized from DIPE to afford final compound 113 (0.14g; mp.185°C ;Yield= 6%) as a white powder. Fraction 2 (0.14g) was crystallized from Et₂O to afford final compound 114 (0.14g ; mp.210°C ;Yield= 6%) as a white powder.

nBuLi 1.6M (4.6ml; 0.0074 mol) was added slowly at -20°C under N₂ flow to a solution of N-(1-methylethyl)-2-propanamine (1ml; 0.0071 mol) in THF (20ml). The mixture was cooled to -70°C . A solution of intermediate compound 15 (prepared according to A10) (2g ; 0.0061 mol) in THF (10ml) was added slowly. The mixture was stirred at -70°C for 30 min. A solution of 3-(dimethylamino)-1-(3,5-difluorophenyl)-1-propanone (prepared according to A10) (2g; 0.0094 mol) in THF (15ml) was added slowly. The mixture was stirred at -70°C for 2 hours, then hydrolysed at -30°C with NH₄Cl 10%aq and extracted with EtOAc. The organic layer was separated, dried (MgSO₄), filtered off and the solvent was evaporated. The residue (4.5g) was purified by column chromatography over silica gel (eluent: CH₂Ch/iPrOHlNH₄OH 99.5/0.5/0.05; 15-40µm). Two pure fractions were collected and their solvents were evaporated. Fraction 1 (0.67g; Yield=20%) was crystallized from DIPE to afford final compound 115 (0.29g ; mp.192°C ;Yield= 9%) as a white powder. Fraction 2 (0.46g) was crystallized from Et₂O to afford final compound 116 (0.22g ; mp. 224°C ; Yield= 7%) as a white powder. From 0.1g of final compound 115, final compounds 116 and 117 (enantiomers) were separated over CHIRACEL OD (eluent: Heptane/iPrOH 99.9/0.1; 15-40µm). Two fractions were collected and crystallized from Et₂O to afford final compound 116 (0.05g ; mp.161°C ;Yield=100%) as a white powder and final compound 117 (0.043g ; mp158°C ; Yield =98%) as a white powder.

The following final compounds were prepared according to the methods described above :

Flat-bottom, sterile 96-well plastic microtiter plates were filled with 100 µl of Middlebrook (1x) broth medium. Subsequently, stock solutions (10 x final test concentration) of compounds were added in 25 µl volumes to a series of duplicate wells in column 2 so as to allow evaluation of their effects on bacterial growth. Serial five-fold dilutions were made directly in the microtiter plates from column 2 to 11 using a customised robot system (Zymark Corp., Hopkinton, MA). Pipette tips were changed after every 3 dilutions to minimize pipetting errors with high hydrophobic compounds. Untreated control samples with (column 1) and without (column 12) inoculum were included in each microtiter plate. Approximately 5000 CFU per well of Mycobacterium tuberculosis (strain H37RV), in a volume of 100 µl in Middlebrook (1x) broth medium, was added to the rows A to H, except column 12. The same volume of broth medium without inoculum was added to column 12 in row A to H. The cultures were incubated at 37°C for 7 days in a humidified atmosphere (incubator with open air valve and continuous ventilation). One day before the end of incubation, 6 days after inoculation, Resazurin (1:5) was added to all wells in a volume of 20 µl and plates were incubated for another 24 hours at 37°C. On day 7 the bacterial growth was quantitated fluorometrically.

The fluorescence was read in a computer-controlled fluorometer (Spectramax Gemini EM, Molecular Devices) at an excitation wavelength of 530 nm and an emission wavelength of 590 nm. The percentage growth inhibition achieved by the compounds was calculated according to standard methods, and MIC data (representing IC90's expressed in microgram/ml) were calculated. The results are shown in Table 5.

Flat-bottom, sterile 96-well plastic microtiter plates were filled with 180 µl of sterile deionized water, supplemented with 0.25 % BSA. Subsequently, stock solutions (7.8 x final test concentration) of compounds were added in 45 µl volumes to a series of duplicate wells in column 2 so as to allow evaluation of their effects on bacterial growth. Serial five-fold dilutions (45 µl in 180 µl) were made directly in the microtiter plates from column 2 to 11 using a customised robot system (Zymark Corp., Hopkinton, MA). Pipette tips were changed after every 3 dilutions to minimize pipetting errors with high hydrophobic compounds. Untreated control samples with (column 1) and without (column 12) inoculum were included in each microtiter plate. Approximately 250 CFU per well of bacteria inoculum, in a volume of 100 µl in 2.8x Mueller-Hinton broth medium, was added to the rows A to H, except column 12. The same volume of broth medium without inoculum was added to column 12 in row A to H. The cultures were incubated at 37°C for 48 hours in a humidified 5% CO₂ atmosphere (incubator with open air valve and continuous ventilation). At the end of incubation, two days after inoculation, the bacterial growth was quantitated fluorometrically. Therefore Alamar Blue (10x) was added to all wells in a volume of 20 µl and plates were incubated for another 2 hours at 50°C.

The fluorescence was read in a computer-controlled fluorometer (Cytofluor, Biosearch) at an excitation wavelength of 530 nm and an emission wavelength of 590 nm (gain 30). The % growth inhibition achieved by the compounds was calculated according to standard methods. The pIC₅₀ was defined as the 50 % inhibitory concentration for bacterial growth. The results are shown in Table 5.