申请人:Astra Lakemedel Aktiebolag
公开号:US05300660A1
公开(公告)日:1994-04-05
Stereoconservative method for preparation of an (R)- or (S)-isomer of the compound of the formula I with at least 95% optical purity ##STR1## wherein R.sup.1 is a hydrogen atom, a saturated or unsaturated lower alkyl group, a cycloalkyl group, or a group (CH.sub.2).sub.m Ph wherein m is 0-3 and Ph is a substituted or unsubstituted phenyl group including 1) O,N-dialkylation, directly or stepwise of (R)- or (S)-proline 2) aminolysis 3) reduction to formation of the (R)- or (S)-isomer of the compound of the formula I, and new intermediates II and III in optical active form obtained by the reaction steps above and wherein R.sup.2 is defined as R.sup.1 above. ##STR2##
用立体保守方法制备化合物的(R)-或(S)-异构体,其光学纯度至少为95%,其中R.sup.1是氢原子、饱和或不饱和的较低烷基基团、环烷基基团,或基团(CH.sub.2).sub.m Ph,其中m为0-3,Ph是取代或未取代的苯基团,包括1)(R)-或(S)-脯氨酸的直接或分步O,N-二烷基化,2)氨解作用,3)还原生成化合物的(R)-或(S)-异构体的方法,以及通过上述反应步骤获得的具有光学活性形式的新中间体II和III,其中R.sup.2被定义为上述的R.sup.1。