to access the isoquinolone motif via cross-coupling/cyclization of benzhydroxamic acid with alkynes is described. The reaction features a regioselective cleavage of a C-H bond on the benzhydroxamic acid coupling partner as well as a regioselective alkyne insertion. Mechanistic studies point out the important involvement of a N-Obond as a tool for C-Nbondformation and catalystturnover.
描述了通过苯异羟肟酸与炔烃的交叉偶联/环化获得异喹诺酮基序的无外部氧化剂过程。该反应的特点是区域选择性裂解苯异羟肟酸偶联物上的 CH 键以及区域选择性炔烃插入。机理研究指出 NO 键作为 CN 键形成和催化剂周转的工具的重要参与。
Rhodium(III)-Catalyzed Arene and Alkene C−H Bond Functionalization Leading to Indoles and Pyrroles
作者:David R. Stuart、Pamela Alsabeh、Michelle Kuhn、Keith Fagnou
DOI:10.1021/ja1082624
日期:2010.12.29
formation of indoles via the oxidative annulation of acetanilides with internal alkynes. The optimized reaction conditions allow for molecular oxygen to be used as the terminal oxidant in this process, and the reaction may be carried out under mild temperatures (60 °C). These conditions have resulted in an expanded compatibility of the reaction to include a range of new internal alkynes bearing synthetically
Access to π-Extended Heterocycles Containing Pyrrolo-Coumarin Cores Involving −COCH<sub>3</sub>as a Traceless Directing Group and Materializing Two Successive sp<sup>2</sup>C–H/sp<sup>3</sup>N–H and sp<sup>2</sup>C–H/sp<sup>2</sup>N–H Activations
作者:Dwaipayan Das、Asish R. Das
DOI:10.1021/acs.joc.2c00958
日期:2022.9.2
Rh(III)-catalyzed C–H activation reaction starting from 3-acetamidocoumarins and internal alkynes. The isolation of the intermediate pyrrolo-coumarin suggests that the −COCH3 group in acetamidocoumarins performs the role of a traceless directing group. Besides, the use of commercially available [Cp*RhCl2]2 adds more importance as no additional modification of the catalyst is required. A two-step protocol bearing
Indole Synthesis via Rhodium Catalyzed Oxidative Coupling of Acetanilides and Internal Alkynes
作者:David R. Stuart、Mégan Bertrand-Laperle、Kevin M. N. Burgess、Keith Fagnou
DOI:10.1021/ja806955s
日期:2008.12.10
The oxidative synthesis of highly functionalized indoles from simple anilines and internal alkynes mediated by a rhodium(III) catalyst is described. Good yields are obtained for a variety of aniline substrates, and good regioselectivity is obtained for the more sterically accessible position when meta-substituted anilines are used. Symmetrical and unsymmetrical alkynes react efficiently with high (>40:1)