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.
Ligandless Copper-Catalyzed β-Boration of α,β-Unsaturated Compounds in Aqueous Solution
作者:Hee-Sung Chea、Hak-Suk Sim、Jae-Sook Yun
DOI:10.5012/bkcs.2010.31.03.551
日期:2010.3.20
water as a co-solvent and a reaction promoter exerted a positive effect on catalytic efficiency and resulted in the efficient β-boration of α,β-unsaturated carbonyl compounds including substituted enones and esters. This new, operationally simple method is useful for the preparation of racemic organoboron compounds.Our investigation of the borationreaction under ligand-free conditions began with β-monosubstituted