申请人:Zaidan Hojin Biseibutsu Kagaku Kenkyu Kai
公开号:US04833268A1
公开(公告)日:1989-05-23
DL- or L-Threo-3-(3,4-dihydroxyphenyl)-N-methyl-serine which may also be termed as DL- or L-threo-adrenalinecarboxylic acid are now provided, which are new compounds useful for therapeutic treatment of Parkinson's disease and mental depression disease. DL-Adrenalinecarboxylic acid may be produced by a new process comprising reacting glycine with O-protected 3,4-dihydroxybenzaldehyde, hydrolyzing the resultant reaction product under acidic conditions to form O-protected DL-3-(3,4-dihydroxyphenyl)serine, isolating the O-protected DL-3-(3,4-dihydroxyphenyl)serine into the threo isomer and the erythro isomer by recrystallization from a suitable organic solvent, introducing an unsubstituted or substituted benzyl group into the 2-amino group of the resulting O-protected DL-threo-3-(3,4-dihydroxyphenyl)serine, then N-methylating the resulting O-protected DL-threo-3-(3,4-dihydroxyphenyl )-N-benzylserine, and removing the O-protecting groups as well as the unsubstituted or substituted benzyl group at the 2-methylamino group of the N-methylation product. L-Adrenalinecarboxylic acid may be produced by a new process comprising introducing a p-methoxybenzyloxycarbonyl group into the 2-amino group of the O-protected DL-threo-3-(3,4-dihydroxyphenyl)serine obtained as an intermediate product, optically resolving the resultant O-protected DL-threo-3-(3,4-dihydroxyphenyl)-N-p-methoxybenzyloxycarbonyl-serine by reacting the latter with an optically active amine and recrystallizing the resultant amine salt products from a suitable organic solvent, removing the p-methoxy-benzyloxycarbonyl group from the resultant O-protected L-threo-(3,4-dihydroxyphenyl)-N-p-methoxybenzyloxycarbonyl-serine, reacting the resultant O-protected L-threo-(3,4-dihydroxyphenyl)serine with dimethyl sulfate in dry acetone to form an O-protected L- or D-threo-(3,4-dihydroxyphenyl)-N-methylserine methyl ester, saponifying this methyl ester and then removing the O-protecting groups from the saponification product.
提供了DL-或L-Threo-3-(3,4-二羟基苯基)-N-甲基丝氨酸,也可称为DL-或L-threo-肾上腺素羧酸,这些是新化合物,可用于治疗帕金森病和精神抑郁症。 DL-肾上腺素羧酸可以通过新工艺生产,包括将甘氨酸与O-保护的3,4-二羟基苯甲醛反应,酸性条件下水解产物以形成O-保护的DL-3-(3,4-二羟基苯基)丝氨酸,通过从适当的有机溶剂中结晶出O-保护的DL-3-(3,4-二羟基苯基)丝氨酸的threo异构体和erythro异构体进行分离,将未取代或取代的苄基引入所得O-保护的DL-threo-3-(3,4-二羟基苯基)丝氨酸的2-氨基组,并N-甲基化所得O-保护的DL-threo-3-(3,4-二羟基苯基)-N-苄基丝氨酸,并去除O-保护基以及N-甲基化产物的2-甲氨基组上的未取代或取代的苄基。 L-肾上腺素羧酸可以通过新工艺生产,包括将p-甲氧基苄氧羰基基团引入作为中间产物所得的O-保护的DL-threo-3-(3,4-二羟基苯基)丝氨酸的2-氨基组,通过与手性活性胺反应并从适当的有机溶剂中结晶出所得的胺盐产物,去除所得的O-保护的L-threo-(3,4-二羟基苯基)-N-p-甲氧基苄氧羰基丝氨酸的p-甲氧基苄氧羰基基团,将所得的O-保护的L-threo-(3,4-二羟基苯基)丝氨酸与干醋酸甲基硫酸酯反应以形成O-保护的L-或D-threo-(3,4-二羟基苯基)-N-甲基丝氨酸甲酯,皂化该甲酯,然后去除皂化产物中的O-保护基。