[EN] TILIDINE ISOMERIZATION AND CRYSTALLIZATION PROCESS<br/>[FR] ISOMÉRISATION DE TILIDINE ET PROCÉDÉ DE CRISTALLISATION
申请人:SIEGFRIED PHARMACHEMIKALIEN MINDEN GMBH
公开号:WO2017021445A1
公开(公告)日:2017-02-09
Tilidine isomerization and crystallization process, comprising providing a reaction mixture comprising cis-tilidine, a dicarboxylic acid, water and an alcohol having 3 to 6 carbon atoms; maintaining the reaction mixture at a temperature T of from 80 °C to 150 °C at specific conditions of time and temperature; removing water from the reaction mixture and crystallizing a trans-tilidine dicarboxylic acid salt from the reaction mixture. The process allows for an efficient integration of isomerization and separation and yields trans-tilidine in a form that is essentially free of side products which are difficult to separate.