申请人:F. HOFFMANN-LA ROCHE AG
公开号:EP1031552A1
公开(公告)日:2000-08-30
The invention relates to an improved process for preparing [(3aR,4S,7aS)-4-bromooctahydro-7a-methyl-1H-indene-1,5-dione]. (S)-(+)-2,3,7,7a-tetrahydro-7a-methyl-1H-indene-1,5(6H)-dione is reduced by reaction with diisobutylaluminum hydride and hexamethylphosphoric triaminde in the presence of a catalyst of the formula R-Cu, wherein R is
and R1, R2 and R3 are each, independently, selected from the group consisting of C1-7 alkyl, phenyl, phenyl substituted by at least one C1-4 alkyl group, benzyl, or benzyl substituted by at least one C1-4 alkyl groups to form a reductate. The reductate is then treated with a bromine-containing electrophile to yield (3aR,4S,7aS)-4-bromooctahydro-7a-methyl-1H-indene-1,5-dione.
本发明涉及一种制备[(3aR,4S,7aS)-4-溴八氢-7a-甲基-1H-茚-1,5-二酮]的改进工艺。(S)-(+)-2,3,7,7a-四氢-7a-甲基-1H-茚-1,5(6H)-二酮在式 R-Cu 的催化剂存在下,通过与氢化二异丁基铝和六甲基三脒磷反应进行还原,其中 R 为
和 R1、R2 和 R3 各自独立地选自 C1-7 烷基、苯基、被至少一个 C1-4 烷基取代的苯基、苄基或被至少一个 C1-4 烷基取代的苄基组成的组,形成还原剂。然后用含溴亲电子体处理还原剂,得到 (3aR,4S,7aS)-4-溴八氢-7a-甲基-1H-茚-1,5-二酮。