Synthesis of isoquinolines based on efficient C–C and C–N bond formation through Rh(III)-catalyzed C–H activation and subsequent intramolecular cyclization is reported. Diazodiesters serving as a C2 source in the newly formed heterocycles are first demonstrated. Additionally, the Rh(III)-catalyzed direct C–H activation/cyclization of benzimidates with diazoketoesters is also described.
Ir(<scp>iii</scp>)-catalyzed synthesis of isoquinolines from benzimidates and α-diazocarbonyl compounds
作者:Xiaobo Yang、Jiyang Jie、Haoyi Li、Meihui Piao
DOI:10.1039/c6ra10045g
日期:——
We report herein a tandem Ir(III)-catalyzed C–H activation and annulation reaction for the synthesis of isoquinolines by using readily available substituted benzimidates and α-diazocarbonyl compounds under mild conditions. The catalytic reaction exhibits excellent tolerance to different functional groups and the corresponding isoquinolines were obtained in good to excellent yields. This novel method
Rh(III)-Catalyzed Synthesis of Multisubstituted Isoquinoline and Pyridine <i>N</i>-Oxides from Oximes and Diazo Compounds
作者:Zhuangzhi Shi、Dennis C. Koester、Mélissa Boultadakis-Arapinis、Frank Glorius
DOI:10.1021/ja406338r
日期:2013.8.21
Multisubstituted isoquinoline and pyridine N-oxides have been prepared by Rh(III)-catalyzed cyclization of oximes and diazo compounds via aryl and vinylic C-H activation. This intermolecular annulation involving tandem C-H activation, cyclization, and condensation steps proceeds under mild conditions, obviates the need for oxidants, releases N-2 and H2O as the byproducts, and displays a broad substituent scope.