Palladium-Catalyzed Cross Coupling Reaction of Benzyl Bromides with Diazoesters for Stereoselective Synthesis of (E)-α,β-Diarylacrylates
摘要:
A Pd-catalyzed cross-coupling reaction of benzyl bromides with alpha-aryldiazoesters is described, and E-alpha,beta-diarylacrylates were obtained in good yields and excellent E-to-Z selectivity (>20:1).
P(NMe<sub>2</sub>)<sub>3</sub>-Mediated Umpolung Alkylation and Nonylidic Olefination of α-Keto Esters
作者:Sunewang Rixin Wang、Alexander T. Radosevich
DOI:10.1021/acs.orglett.5b01784
日期:2015.8.7
A commercial phosphorus-based reagent (P(NMe2)(3)) mediates,umpolung alkylation of methyl aroylformates with benzylic and allylic bromides, leading to either Barer-type addition or ylide-free olefination products upon workup. The reaction sequence is initiated, by a two-electron redox addition of the tricoordinate phosphorus reagent with an alpha-keto ester Compound (Kukhtin-Ramirez addition). A mechanistic rationale is offered for the chemoselectivity upon which the success of this nonmetal mediated C-C bond forming strategy is based.
Palladium-Catalyzed Cross Coupling Reaction of Benzyl Bromides with Diazoesters for Stereoselective Synthesis of (<i>E</i>)-α,β-Diarylacrylates
作者:Wing-Yiu Yu、Yuk-Tai Tsoi、Zhongyuan Zhou、Albert S. C. Chan
DOI:10.1021/ol8026076
日期:2009.1.15
A Pd-catalyzed cross-coupling reaction of benzyl bromides with alpha-aryldiazoesters is described, and E-alpha,beta-diarylacrylates were obtained in good yields and excellent E-to-Z selectivity (>20:1).