Practical and Scalable Kinetic Resolution of BINOLs Mediated by a Chiral Counterion.
Benjamin A JonesTudor BalanJohn D JolliffeCraig D CampbellMartin D SmithPublished in: Angewandte Chemie (International ed. in English) (2019)
BINOLs are valuable and widely used building blocks, chiral ligands, and catalysts that are effective across a remarkable range of different chemical transformations. Here we demonstrate that an ammonium salt catalyzed kinetic resolution of racemic BINOLs with benzyl tosylate proceeds with s up to 46. This is a scalable and practical process that can be applied across >30 different C2 - and non-C2 -symmetric BINOLs. Implementation of this method enables the enantioselective synthesis of a wide range of BINOL derivatives with over 99:1 e.r.