NHC-Catalyzed Atroposelective Acylation of Phenols: Access to Enantiopure NOBIN Analogs by Desymmetrization
作者:Shenci Lu、Si Bei Poh、Zi-Qiang Rong、Yu Zhao
DOI:10.1021/acs.orglett.9b02425
日期:2019.8.2
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 kineticresolution to produce the axially
The axiallychiral biaryls 2 were obtained in high enantioselectivity by desymmetrization of the σ-symmetric biaryl diacetates 1 by lipase-catalyzed hydrolysis.
Axially chiral, tetra-ortho-substituted biphenyl derivatives were efficiently synthesized through desymmetrization of Ï-symmetric precursors by enzyme-catalyzed hydrolysis. Both of the enantiomers were accessible in highly enantioselective manner and in high yield by suitable choice of enzyme.
Enantioselective synthesis of axially chiral sulfur-containing biaryl derivatives through the electrophilic sulfenylation of biaryl phenols has been achieved for the first time. This catalyticasymmetric system, which involves sequential desymmetrization and kinetic resolution, is enabled by a combination of a novel 3,3′-disubstituted BINOL-derived selenide catalyst and an achiral sulfonic acid. Control experiments
The firsttotalsynthesis of dermocanarin 2 is described. The synthesis features the construction of the anthraquinone and naphthoquinone frameworks through annulation reactions onto an axially chiral biphenyl intermediate, obtained by an enzyme-catalyzed enantioselective desymmetrization of a σ-symmetric precursor, followed by a stereoselective aldol reaction to construct the stereogenic center in