Crystalline diastereomeric L-alpha-methyldopa POE ester and process for its preparation

摘要

Disclosed is a crystalline form of diastereomeric L- alpha -methyldopa POE ester, also referred to as (R),(S)- alpha -pivaloyloxyethyl-(S)-3-(3,4-dihydroxyphenyl)-2-methylalaninate and a process for its isolation. Also disclosed is an improved process for the formation of diastereomeric L- alpha -methyldopa POE ester.