Palladium-Catalyzed Selective Carboelimination and Cross-Coupling Reactions of Benzocyclobutenols with Aryl Bromides
摘要:
The palladium-catalyzed selective beta-carboelimination and cross-coupling chemistry of benzocyclobutenols is described. In contrast to the base-mediated ring-opening reactions of benzocyclobutenols, this variant proceeds with exclusive cleavage of the proximal bond.
Pd-catalyzed chemo-, regio-, and enantioselective ring-closing/ring-opening cross couplingreaction has been developed with diverse aryl halide-tethered alkenes and benzocyclobutenols as substrates, which renders the highly enantioselective diarylation of unactivated alkenes and provides a convenient method toward chiral 2,3-dihydrobenzofurans bearing a quaternary stereocenter with excellent enantioselectivities
A palladium-catalyzed sequential Heck coupling/C–C bond activation approach to oxindoles with all-carbon-quaternary centers
作者:Guoliang Mao、Chenxiang Meng、Fangyuan Cheng、Wenbo Wu、Yuan-Yuan Gao、Gao-Wei Li、Lantao Liu
DOI:10.1039/d1ob02440j
日期:——
Catalytic construction of oxindoles bearing all-carbon-quaternary centers attracts wide attention from the synthetic chemistry community. Herein, we report a palladium-catalyzed sequential Heck coupling/C–C bond activation of aryl halide-tethered alkenes with benzocyclobutenols affording a series of oxindole-derived compounds in good to excellent yields, as well as the preliminary enantioselectivity