This invention relates to a process for making a compound of formula I
in the form of a stereoisomer or mixture thereof, wherein R is hydrogen, lower alkyl; X is hydrogen, halo, trifluoromethyl, lower alkyl or lower alkoxy, and the wavy lines represent the a or β configuration with the proviso that when one wavy line is α the other is β, or a pharmaceutically acceptable, non-toxic salt of the compound wherein R is hydrogen; novel intermediates useful for preparing these compounds; processes for making the intermediates; and a stereoisomer of the compound of formula I wherein R is methyl and X is hydrogen and a process for making same.
本发明涉及一种以立体异构体或其混合物形式制备式Ⅰ化合物的工艺,其中R为氢、低级烷基;X为氢、卤代、三
氟甲基、低级烷基或低级烷氧基,波浪线代表a或β构型,但当一条波浪线为α时,另一条波浪线为β,或该化合物的药学上可接受的无毒盐(其中R为氢);制备这些化合物有用的新型中间体;制备这些中间体的工艺;以及式Ⅰ化合物(其中R为甲基,X为氢)的立体异构体及其制备工艺。