申请人:Alfa Chemicals Italiana S.p.A.
公开号:US04724102A1
公开(公告)日:1988-02-09
A new process for the optical resolution of racemic mixtures of .alpha.-naphthylpropionic acids of formula ##STR1## wherein R.sub.1 is (C.sub.1-6) alkyl and R.sub.2 represents hydrogen or a halogen atom comprises reacting a racemic mixture of a compound of formula II ##STR2## wherein R.sub.1 and R.sub.2 have the above seen meanings and R.sub.3 is a reactive group, with an optically active aminoacid of formula ##STR3## wherein R.sub.4 represents a (C.sub.1-8) alkyl, phenyl, substituted phenyl, benzyl, substituted benzyl or carboxy, and m is an integer from 0 to 4, to give a pair of diastereoisomeric amides of formula ##STR4## wherein R.sub.1, R.sub.2, R.sub.4 and m have the above seen meanings, and M is a hydrogen atom or a cation of an alkali metal or a cation of an organic base. Compounds IV are resolved into the single diastereoisomeric amides d,d or 1,d, or d,1 or 1,1. Acid hydrolysis gives the optically active compound I.
一种用于光学分离式.alpha.-萘丙酸的外消旋混合物的新工艺,该酸的化学式为##STR1##
其中R.sub.1是(C.sub.1-6)烷基,R.sub.2代表氢或卤素原子,包括将化学式II的外消旋混合物反应,其中##STR2##
其中R.sub.1和R.sub.2具有上述含义,R.sub.3是反应性基团,与手性氨基酸反应,其化学式为##STR3##
其中R.sub.4表示(C.sub.1-8)烷基,苯基,取代苯基,苄基,取代苄基或羧基,m是0到4的整数,以得到一对对映异构体酰胺,其化学式为##STR4##
其中R.sub.1,R.sub.2,R.sub.4和m具有上述含义,M是氢原子或碱金属离子或有机碱离子。化合物IV可分离成单一的对映异构体酰胺d,d或1,d或d,1或1,1。酸水解可得到光学活性化合物I。