Palladium-Catalyzed Alkenylation via sp<sup>2</sup> C–H Bond Activation Using Phenolic Hydroxyl as the Directing Group
作者:Chun Zhang、Jing Ji、Peipei Sun
DOI:10.1021/jo4028825
日期:2014.4.4
This note describes the efficient and highly regioselectivesynthesis of 2-(2′-alkenylphenyl)phenol derivatives via palladium-catalyzed 2′-alkenylation of 2-arylphenols directed by the phenolic hydroxyl group using benzoquinone as the oxidant in an atmosphere of air. This reaction can tolerate a series of functional groups and provides the alkenylation products regio- and stereoselectively in moderate
Catalytic Enantioselective Intramolecular Oxa-Michael Reaction to α,β-Unsaturated Esters and Amides
作者:Guanglong Su、Michele Formica、Ken Yamazaki、Trevor A. Hamlin、Darren J. Dixon
DOI:10.1021/jacs.3c03182
日期:2023.6.14
bifunctional iminophosphorane (BIMP)-catalyzed, enantioselective intramolecular oxa-Michael reaction of alcohols to tethered, low electrophilicity Michael acceptors is described. Improved reactivity over previous reports (1 day vs 7 days), excellent yields (up to 99%), and enantiomeric ratios (up to 99.5:0.5 er) are demonstrated. The broad reaction scope, enabled by catalyst modularity and tunability, includes