申请人:F. HOFFMANN-LA ROCHE AG
公开号:EP0979824A1
公开(公告)日:2000-02-16
The present invention concerns a process for the preparation of a compound of formula 1 or a salt thereof
characterised in that the process comprises
a) epoxidation of a compound of formula 2 or a salt thereof
in which formulae A is arylene; R1 is -C*R3R4R5; R2 is -O-alkyl, -O-cycloalkyl, -O-alkenyl, -O-aryl, -O-aralkyl, -O-aralkoxyalkyl, -O-alkylsulfonyl, -O-arylsulfonyl, chlorine, bromine or iodine; R3 is hydrogen; R4 is aryl; R5 is alkyl, cycloalkyl, aryl, alkoxyalkyl or hydroxyalkyl; and, wherein C* is an asymmetric carbon atom;
b) optionally followed by isolation of the desired stereoisomer.
本发明涉及一种制备式 1 化合物或其盐的工艺
其特征在于该工艺包括
a) 式 2 化合物或其盐的环氧化反应
其中式 A 为芳基;R1 为-C*R3R4R5;R2 为-O-烷基、-O-环烷基、-O-烯基、-O-芳基、-O-芳烷基、-O-芳烷氧基烷基、-O-烷基磺酰基、-O-芳基磺酰基、氯、溴或碘;R3 为氢;R4 为芳基;R5 为烷基、环烷基、芳基、烷氧基烷基或羟基烷基;且其中 C* 为不对称碳原子;
b) 随后可选择分离出所需的立体异构体。