Process and intermediates for the preparation of an antiviral agent containing a cyclobutyl group
申请人:E.R. SQUIBB & SONS, INC.
公开号:EP0535448A2
公开(公告)日:1993-04-07
Racemic Feist's acid is treated with (R)-(+)-a-methylbenzylamine to yield (1R-trans)-3-methylenecyclopropane-1,2-dicarboxylic acid, (R)-a-methylbenzylamine (1:1) salt. This salt can then be converted to (1R-trans)-3-methylene-1,2-cyclopropanedicarboxylic acid, dimethyl ester which is an intermediate in the preparation of the antiviral agent Ä1R-(1a,2b,3a)Ü-2-amino-9-Ä2,3-bis(hydroxymethyl)cyclobutylÜ-1,9-dihydro-6H-purin-6-one. The improved process also enables the recovery of racemic Feist's acid from the resolution.
混合型的费斯特酸经过(R)-(+)-α-甲基苄胺的处理,生成(1R-trans)-3-亚甲基环丙烷-1,2-二羧酸,与(R)-α-甲基苄胺(1:1)盐。该盐可转化为(1R-trans)-3-亚甲基-1,2-环丙烷二羧酸,二甲酯,该中间体用于制备抗病毒剂Ä1R-(1a,2b,3a)Ü-2-氨基-9-Ä2,3-双(羟甲基)环丁基Ü-1,9-二氢-6H-嘌呤-6-酮。改进的工艺还能使费斯特酸从分离中恢复。