申请人:——
公开号:US20030092142A1
公开(公告)日:2003-05-15
A process for the preparation of chiral &agr;-hydroxycarboxylic acids:
1
in which R1 is optionally halogen substituted C
1
-C
2
-alkyl and R2 is optionally halogen substituted C
2
-C
3
-alkyl from a compound:
2
in which R′
2
is optionally halogen substituted C
2
-C
3
-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, C
1
-C
6
-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:
3
which then is converted by means of acidic hydrolysis into an acid:
4
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-羟基羧酸的方法:其中R1是可选的卤代C1-C2烷基,R2是可选的卤代C2-C3烷基,从化合物2开始:其中R'2是可选的卤代C2-C3亚烷基,m为0或1,R是可选的取代烷基,芳基,杂芳基或杂环基,X可以是氧,硫,亚磺酰,磺酰,亚胺,C1-C6-烷基亚胺,黄原酸酯,硅烷基或,如果m等于0,则为卤素,它在氰基供体的存在下反应,以给出相应的(R)-或(S)-氰醇或其消旋体3:然后通过酸性水解将其转化为酸4或其消旋体,并通过断裂基团(R)m-X(V)和可选的分离来获得所需的手性α-羟基羧酸式(I)。