申请人:MERCK SHARP & DOHME LTD.
公开号:EP0456310A2
公开(公告)日:1991-11-13
A process for preparing a substantially pure enantiomer of a compound formula (I)
wherein X is O or S; and
R² represents hydrogen, -CF₃, -OR⁷, -SR⁷, -NR⁷R⁸, -CN, -COOR⁷, -CONR⁷R⁸, or a saturated or unsaturated, substituted or unsubstituted hydrocarbon group, wherein R⁷ and R⁸ are independently selected from hydrogen and C₁₋₂alkyl provided that -NR⁷R⁸ is other than NH₂;
which process comprises cyclisation of a compound of formula (10) or salt thereof:
wherein X and R² are as defined in formula (I); and R⁴ is a labile leaving group and optionally epimersing the endo-diastereomer so prepared to produce the corresponding exo-diastereomer.
一种制备基本纯的式 (I) 化合物对映体的工艺
其中 X 是 O 或 S;以及
R² 代表氢、-CF₃、-OR⁷、-SR⁷、-NR⁷R⁸、-CN、-COOR⁷、-CONR⁷R⁸或饱和或不饱和、其中 R⁷ 和 R⁸ 独立选自氢和 C₁₋₂ 烷基,条件是 -NR⁷R⁸ 不是 NH₂;
该工艺包括式 (10) 化合物或其盐的环化:
其中 X 和 R² 如式(I)中定义;R⁴ 是易变离去基团,并任选将制备的内-非对映异构体外嵌,生成相应的外-非对映异构体。