NHC-Catalyzed Atroposelective Acylation of Phenols: Access to Enantiopure NOBIN Analogs by Desymmetrization.

Herein we present a highly efficient N-heterocyclic-carbene (NHC)-catalyzed atroposelective acylation of amino bisphenols to provide access to a wide range of 1,1'-biaryl-2,2'-amino alcohols (NOBIN analogs) in high yield and with uniformly excellent enantioselectivity. This catalytic system is shown to proceed through a combination of desymmetrization and secondary kinetic resolution to produce the axially chiral products in excellent enantioselectivity.