Construction of C(sp<sup>2</sup>)–Si Bonds via Ligand-Promoted C–C Bonds Cleavage of Unstrained Ketones
作者:Xing Wang、Zhen-Yu Wang、Xu Zhang、Hui Xu、Hui-Xiong Dai
DOI:10.1021/acs.orglett.2c02841
日期:2022.10.14
Herein, we report an efficient palladium-catalyzed silylation of aryl and alkenyl ketonesviaC–Cbondcleavage and C–Si bond formation. This protocol features high efficiency and broad substrate scope. Further applications in the late-stage diversification of biologically important molecules demonstrate the synthetic utility of this method.
The umpolung of β,γ-unsaturated diketones through N-heterocyclic carbene catalysis is described, which allows access to a variety of highly functionalized bicyclic cyclohexene-β-lactones and 1,3,4-triaryl benzenes. An unprecedented reaction pattern involving the catalytic formation of nucleophilic O-acylated homoenolate intermediate is proposed. A diverse set of transformations on the product further