Asymmetric β-boration of α,β-unsaturated carbonyl compounds with chiral Rh[bis(oxazolinyl)phenyl] catalysts
摘要:
Chiral rhodium[bis(oxazolinyl)phenyl] complexes exhibited high catalytic activity for the beta-boration of alpha,beta-unsaturated esters, ketones, and amides with bis(pinacolato)diboron in the presence of sodium tertbutoxide to attain high enantioselectivity of up to 97%. The substrate scope and catalytic mechanism were discussed. (C) 2013 Elsevier Ltd. All rights reserved.
Asymmetric β-boration of α,β-unsaturated carbonyl compounds with chiral Rh[bis(oxazolinyl)phenyl] catalysts
摘要:
Chiral rhodium[bis(oxazolinyl)phenyl] complexes exhibited high catalytic activity for the beta-boration of alpha,beta-unsaturated esters, ketones, and amides with bis(pinacolato)diboron in the presence of sodium tertbutoxide to attain high enantioselectivity of up to 97%. The substrate scope and catalytic mechanism were discussed. (C) 2013 Elsevier Ltd. All rights reserved.
Enantioselective 1,1-Arylborylation of Alkenes: Merging Chiral Anion Phase Transfer with Pd Catalysis
作者:Hosea M. Nelson、Brett D. Williams、Javier Miró、F. Dean Toste
DOI:10.1021/jacs.5b00344
日期:2015.3.11
A palladium-catalyzed three-component coupling of α-olefins, aryldiazonium salts, and bis(pinacolato)diboron affords direct access to chiral benzylic boronic esters. This process is rendered highly enantioselective using an unprecedented example of cooperative chiralanionphasetransfer and transition-metal catalysis.