ChemInform Abstract: Chiral Ammonium Betaines as Ionic Nucleophilic Catalysts.

Abstract

Chiral Ammonium Betaines as Ionic Nucleophilic Catalysts. -Chiral betaine NAB is a highly enantioselective catalyst for the Steglich rearrangement of oxazolyl trichloroethyl carbonates (I) providing oxazolones bearing a quaternary stereogenic carbon atom. -(URAGUCHI, D.; KOSHIMOTO, K.; MIYAKE, S.; OOI*, T.; Angew.