A process for the separation of a racemic mixture of the S(+) and R(-) optical isomers of an oxazolidinone compound of the formula:
(in which R is a straight or branched C₁-C₈ alkyl group) which process comprises reacting the racemic 3-alkyl-5-hydroxy-methyl-oxazolidin-2-one derivative of formula (I) with an esterifying compound which is
(a) an ester of the formula:
(in which Rʹ is a straight or branched C₁-C₁₀ alkyl or alkenyl group, and Rʺ is a straight or branched C₁-C₄ alkyl or alkenyl group, a haloalkyl group or a diacylglycerolic group),
(b) an acid of the formula:
Rʺʹ-COOH (V)
(in which Rʺʹ is a straight or branched C₁-C₂₀ alkyl or alkenyl group) or
(c) an anhydride of the formula:
(in which RIV is a straight or branched C₁-C₆ alkyl group)
the reaction being carried out in the presence of an enzyme, immobilized on a porous carrier, capable of selectively giving rise to the esterification of the R(-) isomer, while leaving the S(+) isomer of the racemic starting compound of formula (I) substantially unchanged;
and separating the S(+) isomer.
一种分离式中
噁唑烷酮化合物的 S(+)和 R(-)光学异构体的外消旋混合物的工艺:
(其中 R 为直链或支链 C₁-C₈烷基),该工艺包括将式(I)的外消旋 3-烷基-
5-羟甲基-
噁唑烷-2-酮衍
生物与酯化化合物反应,该酯化化合物为
(a) 式中的酯:
(其中 Rʹ 是直链或支链 C₁-C₁₀ 烷基或烯基,Rʺ 是直链或支链 C₁-C₄ 烷基或烯基、卤代烷基或二酰基
甘油基)、
(b) 式中的酸:
Rʺʹ-COOH (V)
(其中 Rʺʹ 是直链或支链 C₁-C₂₀ 烷基或烯基)或
(c) 式中的酸酐:
(其中 RIV 为直链或支链 C₁-C₆烷基)。
该反应在固定于多孔载体上的酶存在下进行,该酶能够选择性地引起 R(-)异构体的酯化,而使式(I)外消旋起始化合物的 S(+)异构体基本保持不变;
分离 S(+)异构体。