There is disclosed a process for producing an optically active hemiester of formula (1):
1
wherein R
1
, R
2
and R
5
represent the same meanings as described below, which comprises reacting a cyclic acid anhydride of formula (2):
2
wherein R
1
and R
2
are different and independently represent
a hydrogen atom, a halogen atom,
an alkyl group optionally substituted with an alkoxy group or a halogen atom, and the like, with a hydroxy compound of formula (3):
R
3
OH (3)
wherein R
3
represents
an alkyl group optionally substituted with an alkoxy group, a phenoxy group, a dialkylamino group or a halogen atom and the like, in the presence of an asymmetric catalyst.
揭示了一种生产式(1)的光学活性半酯的过程:其中R1,R2和R5代表如下所述的相同含义,包括将式(2)的
环酸酐与式(3)的羟基化合物在不对称催化剂存在下反应,其中R1和R2分别代表氢原子、卤素原子、可能用烷氧基或卤素原子取代的烷基基团等,R3代表可能用烷氧基、苯氧基、二烷基胺基或卤素原子取代的烷基基团等。