Expedient Dual Co/Organophotoredox Catalyzed Stereoselective Synthesis of All‐Carbon Quaternary Centers
作者:Àlex Cristòfol、Bart Limburg、Arjan W. Kleij
DOI:10.1002/anie.202103479
日期:2021.7.5
An efficient and attractive Co/organophotoredox dualcatalysis protocol has been developed allowing the stereoselective access to a wide variety of syn-configured 1,3-diols featuring quaternary carbon centers. The synthesis of the target molecules is achieved under ambient reaction conditions using modular and accessible reagents, substituted vinyl cyclic carbonates and aldehydes, and in short reaction
Pd-Catalyzed Allylic Alkylation of <i>gem-</i>Alkyl,Aryl-Disubstituted Allyl Reagents with Ketones: Diastereoselective Construction of Vicinal Tertiary and Quaternary Carbon Centers
(E)-gem-Alkyl,aryl-disubstituted allylcarbonates can react with ketones under Pd catalysisusing a commercially available NHC ligand by suppressing the β-H elimination. Ketones with α-tertiary, β-quaternary carbon stereocenters were produced in high yields with high regio- and diastereoselectivities. Kinetic resolution of the reaction product via CBS reduction afforded the optically active ketone
Stereoselective Three-Component Allylic Alkylation Enabled by Dual Photoredox/Ni Catalysis
作者:Qian Zeng、Fengyun Gao、Jordi Benet-Buchholz、Arjan W. Kleij
DOI:10.1021/acscatal.3c01686
日期:2023.6.2
modular and practical approach has been developed for the stereoselective formation of elaborate allylic alcohols through a three-component reaction (3CR) between vinyl cyclic carbonates, olefins, and various radical precursors using dual photoredox/Ni catalysis. The developed process expands the potential of radical-based allylicalkylation to multicomponent approaches under high regio- and stereocontrol