申请人:Chisso Corporation
公开号:US05574182A1
公开(公告)日:1996-11-12
An ester is caused to act on a 2-substituted-3-hydroxycarboxylic acid ester as a racemate in the presence of hydrolase under substantially anhydrous conditions to effect a transesterification resulting in the resolution. The compound thus resolved is converted to an optically active 2,6-cis-2,5,6-substituted-1,3-dioxan-4-one and the resulting compound is recrystallized to give optically active 5,6-anti-2,5,6-substituted-1,3-dioxan-4-one and 5,6-syn-2,5,6-substituted-1,3-dioxan-4-one. Thus an optically active compound having plural chiral centers. Further, an optically active 2,5,6-substituted-1,3-dioxan-4-one obtained by transesterification and recrystallization is reacted with an alcohol to produce an optically active 2-substituted-3-hydroxycarboxylic acid ester.
在基本无水的条件下,通过酯在水解酶的存在下作用于2-取代-3-羟基羧酸酯的外消旋体,以产生一种酯交换反应来进行分辨。因此,被分辨的化合物被转化为光学活性的2,6-顺式-2,5,6-取代-1,3-二氧杂环己酮,并通过再结晶得到光学活性的5,6-反式-2,5,6-取代-1,3-二氧杂环己酮和5,6-顺式-2,5,6-取代-1,3-二氧杂环己酮。因此,得到了具有多个手性中心的光学活性化合物。此外,通过酯交换反应和再结晶得到的光学活性的2,5,6-取代-1,3-二氧杂环己酮与醇反应,产生一种光学活性的2-取代-3-羟基羧酸酯。