Process for optically active threo-3-(3,4-methylenedioxyphenyl) serine.

摘要

A process for the production of optically active threo-3-(3,4-methylenedioxyphenyl)serine of formula: CHEM contiene="yes" which comprises subjecting racemic threo-3-(3,4-methylenedioxyphenyl) serine alkyl ester of formula: CHEM contiene="yes" wherein R is alkyl having 1 to 4 carbon atoms to optical resolution by using a resolving agent selected from the group consisting of optically active pyroglutamic acid and optically active dibenzoyltartaric acid in a solvent medium, separating the insoluble diastereomer salt, producing D or L-threo-3-(3,4-methylenedioxyphenyl)serine alkyl ester therefrom by treatment with an aqueous alkali, and then hydrolysing it to obtain optically active threo-3-(3,4-methylenedioxyphenyl)serine, which is useful as intermediate for producing optically active threo-3-(3,4-dihydroxyphenyl)serine.