申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0084928A1
公开(公告)日:1983-08-03
A process for producing an optically active threo-3-(3,4--dihydroxyphenyl)serine represented by the formula
which is useful as a remedy for peripheral orthostatic hypotension or as an antidepressant, which process comprises (A) treating threo-3-(3,4-methylenedioxyphenyl)serine or an N-carbobenzoxy derivative thereof represented by the formula
wherein A represents a hydrogen atom or a carbobenzoxy group, with a Lewis acid to form threo-3(3,4-dihy- droxyphenyllserine or an N-carbobenzoxy derivative thereof represented by the formula
wherein A is a defined above, and, if A is a carbobenzoxy group, catalytically reducing the resulting compound of formula (2); or (B) allowing the crystals of an optically active threo-3-(3,4--dihydroxyphenyl)serine to be present in a supersaturated solution of racemic threo-3-(3,4-dihydroxyphenyi)serine, and allowing the same optically active threo-3-(3,4-dihydroxyphenyl)serine as said crystals to crystallize preferentially out of said supersaturated solution; a racemic or optically active threo-N-carbobenzoxy-3-(3,4-methytenedioxyphenyl)serine represented by the formula
which is a novel compound useful as an intermediate in the above synthesis; and a process for producing said novel com pound.
一种生产光学活性苏-3-(3,4-二羟基苯基)丝氨酸的工艺,其化学式为
该工艺包括 (A) 用如下式子表示的硫代-3-(3,4-亚甲基二氧苯基)丝氨酸或其 N-羰基苯氧基衍生物进行处理
其中 A 代表氢原子或羰基苯氧基,用路易斯酸形成由式表示的硫代-3-(3,4-二亚甲基二氧苯基)丝氨酸或其 N-羰基苯氧基衍生物; (B) 用路易斯酸处理由式表示的硫代-3-(3,4-二亚甲基二氧苯基)丝氨酸或其 N-羰基苯氧基衍生物。
其中 A 是上文所定义的,如果 A 是羰基苯氧基,则催化还原生成的式 (2) 化合物;或 (B) 使外消旋苏-3-(3,4-二羟基苯基)丝氨酸的过饱和溶液中存在光学活性苏-3-(3,4-二羟基苯基)丝氨酸的晶体,并使与所述晶体相同的光学活性苏-3-(3,4-二羟基苯基)丝氨酸优先从所述过饱和溶液中结晶出来;一种外消旋或具有光学活性的硫代-N-苄氧基-3-(3,4-甲基tenedioxyphenyl)丝氨酸,其化学式为
这是一种新型化合物,可用作上述合成的中间体;以及生产上述新型化合物的工艺。