Chiral Cyclic Alkyl Amino Carbene (CAAC) Transition-Metal Complexes: Synthesis, Structural Analysis, and Evaluation in Asymmetric Catalysis
作者:Adrien Madron du Vigné、Nicolai Cramer
DOI:10.1021/acs.organomet.2c00351
日期:2022.10.10
Despite recent advances in the field of cyclicalkylaminocarbenes (CAACs) including a few complementary synthetic strategies affording CAACs with various substitution patterns, the application potential of chiral CAACs to efficiently catalyze asymmetric organometallic transformations remains largely underdeveloped. Herein, we describe a convenient and robust route that incorporates common chiral
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.
Catalytic Asymmetric Boration of Acyclic α,β-Unsaturated Esters and Nitriles