申请人:DSM Fine Chemicals Austria NFG GmbH & Co KG
公开号:US06818423B2
公开(公告)日:2004-11-16
A process for the preparation of chiral &agr;-hydroxycarboxylic acids:
in which R1 is optionally halogen substituted C1-C2-alkyl and R2 is optionally halogen substituted C2-C3-alkyl from a compound:
in which R′2 is optionally halogen substituted C2-C3-alkylene, m is 0 or 1 and R is optionally substituted alkyl, aryl, heteroaryl or heterocyclyl and X can be oxygen, sulfur, sulfinyl, sulfonyl, imino, C1-C6-alkylimino, xanthate, silyl, or, if m is equal to 0, halogen,
which is reacted in the presence of a cyanide group donor to give the corresponding (R)- or (S)-cyanohydrin or its racemate:
which then is converted by means of acidic hydrolysis into an acid:
or its racemate, and by cleavage of the group:
(R)m-X (V), and
optional resolution, whereby the desired chiral &agr;-hydroxycarboxylic acid of the formula (I) is obtained.
一种制备手性α-羟基羧酸的过程:其中R1是可选卤代的C1-C2-烷基,R2是可选卤代的C2-C3-烷基,从一种化合物中:其中R′2是可选卤代的C2-C3-亚烷基,m为0或1,R是可选取代的烷基、芳基、杂芳基或杂环烷基,X可以是氧、硫、亚砜、磺酰、亚胺、C1-C6-烷基亚胺、黄药酯、硅基,或者如果m等于0,卤素,在氰基供体的存在下反应,得到相应的(R)-或(S)-氰醇或其消旋体:然后通过酸水解转化为酸:或其消旋体,并通过裂解基团:(R)m-X,可选分离,从而获得所需的手性α-羟基羧酸的公式(I)。