申请人:E. R. Squibb & Sons, Inc.
公开号:US05185463A1
公开(公告)日:1993-02-09
Racemic Feist's acid is treated with (R)-(+)-.alpha.-methylbenzylamine to yield (1R-trans)-3-methylenecyclopropane-1,2-dicarboxylic acid, (R)-.alpha.-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 [1R-(1.alpha.,2.beta., 3.alpha.)]-2-amino-9-[2,3-bis(hydroxymethyl)cyclobutyl]-1,9-dihydro-6H-pur in-6-one. The improved process also enables the recovery of racemic Feist's acid from the resolution.
混合型的费斯特酸与(R)-(+)-α-甲基苄胺反应,生成(1R-顺式)-3-亚甲基环丙烷-1,2-二羧酸,(R)-α-甲基苄胺(1:1)盐。这种盐可以转化为(1R-顺式)-3-亚甲基-1,2-环丙烷二羧酸二甲酯,这是制备抗病毒药物[1R-(1α,2β,3α)]-2-氨基-9-[2,3-双(羟甲基)环丁基]-1,9-二氢-6H-嘌呤-6-酮的中间体。改进的过程还使得可以从分离中回收混合型费斯特酸。