申请人:Merck Sharp & Dohme Ltd.
公开号:US05124460A1
公开(公告)日:1992-06-23
A process for preparing a substantially pure enantiomer of a compound formula (I) ##STR1## wherein X is O or S; and R.sup.2 represents hydrogen, --CF.sub.3, --OR.sup.7, --SR.sup.7, --NR.sup.7 R.sup.8, --CN, --COOR.sup.7, --CONR.sup.7 R.sup.8, or a saturated or unsaturated, substituted or unsubstituted hydrocarbon group, wherein R.sup.7 and R.sup.8 are independently selected from hydrogen and C.sub.1-2 alkyl provided that --NR.sup.7 R.sup.8 is other than NH.sub.2 ; which process comprises cyclization of a compound of formula (10) or salt thereof: ##STR2## wherein X and R.sup.2 are as defined in formula (I); and R.sup.4 is a labile leaving group and optionally epimerizing the endo-diastereomer so prepared to produce the corresponding exo-diastereomer.
一种制备化合物公式(I)的基本纯对映体的方法,其中X为O或S;R.sup.2代表氢,-CF.sub.3,-OR.sup.7,-SR.sup.7,-NR.sup.7 R.sup.8,-CN,-COOR.sup.7,-CONR.sup.7 R.sup.8,或饱和或不饱和,取代或未取代的碳氢基团,其中R.sup.7和R.sup.8独立地选择自氢和C.sub.1-2烷基,但-NR.sup.7 R.sup.8不是NH.sub.2;该方法包括将公式(10)的化合物或其盐环化:其中X和R.sup.2如公式(I)中定义;R.sup.4是一个不稳定的离去基团,并且可选择对所制备的内端异构体进行外消旋,以产生相应的外端异构体。