申请人:NIPPON KAYAKU CO., LTD.
公开号:EP0885879A1
公开(公告)日:1998-12-23
An optically active cyanohydrin represented by the following general formula (1):
wherein each of R1 and R2 is a hydrogen atom or an amino-protecting group, and the configurations relating to the carbon atoms at the *2-position and *3-position are as follows: in the case of the carbon atom at the *2-position being in R-configuration, the carbon atom at the *3-position is in S-configuration, and in the case of the carbon atom at the *2-position being in S-configuration, the carbon atom at the *3-position is in R-configuration, can be efficiently produced by crystallizing one of the optically active cyanohydrins while treating a mixture of cyanohydrin diastereomers in the presence of an amine and an organic solvent to change the configuration relating to the carbon atom at the 2-position and thereby cause isomerization.
由以下通式(1)代表的光学活性氰醇:
其中 R1 和 R2 各为氢原子或氨基保护基团,*2 位和*3 位碳原子的构型如下:在*2位的碳原子为R构型的情况下,*3位的碳原子为S构型;在*2位的碳原子为S构型的情况下,*3位的碳原子为R构型、在胺和有机溶剂存在下处理氰醇非对映异构体混合物,以改变与 2 位碳原子相关的构型,从而导致异构化,通过结晶其中一种具有光学活性的氰醇,可以有效地生产氰醇非对映异构体。