An Improved Scalable Process for the Synthesis of (S,S)-DACH-Ph Trost Ligand

Abstract An improved chemical process has been developed for the synthesis of (S,S)-DACH-Ph Trost ligand. The amidation 2-diphenylphosphinylbenzoic acid and (S,S)-diaminocyclohexane is promoted by stoichiometric CDI catalytic imidazole hydrochloride. resulting product, ligand, isolated as a white solid in 80% yield with >99% ee simple filtration without column chromatography. current facile also demonstrated on kilogram scale.