Kinetic Resolution of Tertiary 2-Alkoxycarboxamido-Substituted Allylic Alcohols by Chiral Phosphoric Acid Catalyzed Intramolecular Transesterification

摘要

A highly enantioselective kinetic resolution of tertiary 2-alkoxycarboxamido allylic alcohols has been achieved through a chiral phosphoric acid catalyzed intramolecular transesterification reaction. Both alkyl,aryl- and dialkyl-substituted tertiary allylic alcohols were resolved with excellent efficiencies, affording both the recovered tertiary alcohols and the carbamate products with high enantioselectivities (with s factors up to 164.6). A gram-scale reaction with 1 mol % catalyst loading and the facile conversion of the enantioenriched products into useful chiral building blocks, such as chiral oxazolidinones and beta-amino alcohols, demonstrate the value of this reaction.