申请人:TANABE SEIYAKU CO., LTD.
公开号:EP0808824A2
公开(公告)日:1997-11-26
A novel process for preparing optically active 2-halogeno-3-hydroxypropionic acid ester compound (III), which comprises reacting the aldehyde compound (I) with the silylketene acetal compound (II) in the presence of a chiral Lewis acid, as illustrated below.
wherein R is aryl, cycloalkyl, etc., one of X1 and X2 is H, and the other is Cl or Br, or both are Cl or Br, R1, R2 and R3 are the same or different, and are lower alkyl or aryl, R4 is lower alkyl or aryl, and * is asymmetric carbon atom. The compound (III) is very useful as an intermediate for preparing medicament such as diltiazem hydrochloride.
一种制备光学活性 2-卤代-3-羟基丙酸酯化合物(III)的新工艺,包括在手性路易斯酸存在下,使醛化合物(I)与硅酮缩醛化合物(II)反应,如下图所示。
其中 R 为芳基、环烷基等,X1 和 X2 中的一个为 H,另一个为 Cl 或 Br,或两者均为 Cl 或 Br,R1、R2 和 R3 相同或不同,且为低级烷基或芳基,R4 为低级烷基或芳基,* 为不对称碳原子。化合物(III)作为制备盐酸地尔硫卓等药物的中间体非常有用。