A Novel Chiral Resolving Reagent, Bis((<i>S</i>)-Mandelic acid)-3-nitrophthalate, for Amlodipine Racemate Resolution: Scalable Synthesis and Resolution Process

Abstract

A novel bis((S)-mandelic acid)-3-nitrophthalate (1), a chiral resolving reagent for the separation of (S)-(−)-isomers of amlodipine from the racemate thereof, is designed and synthesized. A simple three-step pilot-scale preparation of 1, along with the optimization of a resolution process on the racemate amlodipine, is reported.