A process for the preparation of a pharmaceutically active compound in a stereospecific form of the formula
or a pharmaceutically acceptable salt or ester thereof, like an alkali metal salt or an alkaline earth metal salt or a pivaloyl ester, wherein R₁ represents an optionally substituted aryl group such as a phenyl or naphthyl group optionally included in a heterocyclic ring system, which is optionally substituted, or represents a heteroaromatic ring system containing in addition to carbon atoms one or more atoms selected from nitrogen, sulphur and oxygen, this ring system being optionally substituted, which comprises subjecting a compound of the formula
wherein R₂ is an ester residue and preferably an alkyl group optionally substituted, to the action of a micro-organism having the ability for stereoselective hydrolysis of compound (II) into compound (I), having at least 80% by weight the S-configuration, and if desired converting compound (I) into the pharmaceutically acceptable salt or ester thereof.
一种制备式中立体特异形式的药用活性化合物的工艺
或其药学上可接受的盐或酯,如碱
金属盐或碱土
金属盐或
新戊酰基酯,其中 R₁ 代表任选取代的芳基,如任选包含在杂环环系中的苯基或
萘基,该杂环环系被任选取代,或代表除碳原子外还含有一个或多个选自氮、
硫和氧的原子的杂芳环环系,该环系被任选取代,该工艺包括将式中的化合物
其中 R₂ 是酯残基,最好是任选被取代的烷基,在微
生物的作用下,具有将化合物 (II)立体选择性
水解为化合物(I)的能力,按重量计,化合物(I)至少有 80% 的 S 构型,如果需要,将化合物(I)转化为药学上可接受的盐或酯。