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.
A Rh(I)-catalyzed intermolecular cyclization between isocyanates and benzocyclobutenols leading to isoquinolin-1(2H)-ones through selective cleavage of a C–C bond has been realized. Exploiting the same strategy, we developed a Rh(I)-catalyzed three-component reaction of benzocyclobutenols, isonitriles, and sulfonyl azides to access isoquinolin-1(2H)-imines. These procedures provide unique and expeditious
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
Formal Carbene Insertion into C–C Bond: Rh(I)-Catalyzed Reaction of Benzocyclobutenols with Diazoesters
作者:Ying Xia、Zhenxing Liu、Zhen Liu、Rui Ge、Fei Ye、Mohammad Hossain、Yan Zhang、Jianbo Wang
DOI:10.1021/ja500118w
日期:2014.2.26
formal carbeneinsertion into C-C bond of benzocyclobutenols has been realized by employing diazoesters as carbene precursors. The product indanol derivatives were obtained in good yields and in diastereoselective manner under mild reaction conditions. All-carbon quaternary center is constructed at the carbenic carbon. This catalytic reaction involves selective cleavage of C-C bond, Rh(I) carbene insertion
已经通过使用重氮酯作为卡宾前体实现了 Rh(I) 催化的形式卡宾插入苯并环丁烯醇的 CC 键。在温和的反应条件下,以良好的收率和非对映选择性的方式获得了产物茚满醇衍生物。全碳四元中心是在碳碳上构建的。该催化反应涉及 CC 键的选择性裂解、Rh(I) 卡宾插入和分子内醛醇反应。
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