(+)- and (-)-etodolac enantiomers were prepared both by classical resolution via crystallisation of diastereoisomeric salts with (+) and (-)-alpha-methylbenzylamine, and by suitable manipulation of derivatives (-)-3- and (+)-4, obtained by lipase-catalysed kinetic resolution of racemic 3. X-ray diffraction analysis of the 4-bromobenzoate derivative of (+)-3, obtained from enantiopure acetate (+)-4, allowed us to determine the absolute (R) configuration of(-)-etodolac. (C) 1997 Elsevier Science Ltd.
(+)和(-)异构体的
托美汀是通过经典的解析方法制备的,具体是通过与(+)和(-)-α-甲基
苄胺形成对映异构盐并在结晶过程中解析对映体,同时也是通过对由
脂肪酶催化的对映纯
托美汀3的对映异构体的修饰。通过对从对映纯
醋酸盐(+)4获得的(+)3的
4-溴苯甲酸衍
生物进行X射线衍射分析,我们确定了(-)-
托美汀的绝对(R)构型。© 1997 Elsevier Science Ltd.