06-11-2014 дата публикации
Номер: US20140330016A1
Provided herein are processes for the preparation of 3-(5-amino-2-methyl-4-oxoquinazolin-3(4H)-yl)piperidine-2,6-dione, or an enantiomer or a mixture of enantiomers thereof; or a pharmaceutically acceptable salt thereof. 1. A method for preparing 3-(5-amino-2-methyl-4-oxoquinazolin-3(4H)-yl)piperidine-2 ,6-dione , or an enantiomer or a mixture of enantiomers thereof; or a pharmaceutically acceptable salt , solvate , hydrate , or polymorph thereof; comprising the step of reducing 3-(2-methyl-5-nitro-4-oxoquinazolin-3(4H)-yl)piperidine-2 ,6-dione via transfer hydrogenation to form 3-(5-amino-2-methyl-4-oxoquinazolin-3(4H)-yl)piperidine-2 ,6-dione , or an enantiomer or a mixture of enantiomers thereof; or a pharmaceutically acceptable salt , solvate , hydrate , or polymorph thereof.2. The method of claim 1 , wherein the transfer hydrogenation is conducted in the presence of a hydrogen donor.3. The method of claim 2 , wherein the hydrogen donor is (i) a Calcohol claim 2 , Ccarboxylic acid claim 2 , Ccarboxylic acid salt claim 2 , Ccarboxylic acid ester claim 2 , Calkene claim 2 , Ccycloalkene claim 2 , Carene claim 2 , heteroarene claim 2 , or heterocycle claim 2 , each of which is optionally substituted with one or more substituents Q; or (ii) diazene claim 2 , hydrazine claim 2 , hydroxylamine claim 2 , or NaHPO;{'sub': 1-6', '2-6', '2-6', '3-10', '6-14', '7-15', '2', '2', '2', '2', '2', '2', '1-6', '2-6', '2-6', '3-10', '6-14', '7-15, 'sup': a', 'a', 'a', 'b', 'c', 'a', 'b', 'c', 'a', 'a', 'a', 'b', 'c', 'a', 'b', 'c', 'a', 'a', 'b', 'c', 'b', 'c', 'b', 'c', 'a', 'd', 'a', 'd', 'a', 'b', 'c', 'a', 'd', 'b', 'c', 'a', 'd', 'a', 'd', 'a', 'b', 'c', 'a', 'b', 'c', 'a', 'd', 'a', 'd', 'a', 'd', 'a', 'a', 'a', 'b', 'c', 'b', 'c', 'a', 'b', 'c', 'd', 'a', 'b', 'c', 'a, 'wherein each substituent Q is independently selected from the group consisting of (a) oxo, halo, cyano, and nitro; (b) Calkyl, Calkenyl, Calkynyl, Ccycloalkyl, Caryl, Caralkyl, heteroaryl, and heterocyclyl, ...
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