Asymmetric Addition of Indoles to Isatins Catalysed by Bifunctional Modified Cinchona Alkaloid Catalysts
作者:Pankaj Chauhan、Swapandeep Singh Chimni
DOI:10.1002/chem.201000846
日期:——
Simple and selective: An efficient organocatalyticenantioselective method for the synthesis of substituted‐3‐hydroxyoxindole derivatives with a quaternary chiral carbon has been developed. The cinchona alkaloid derived catalyst catalyses the Friedel–Crafts‐type addition of indole derivatives to the isatin derivatives under mild conditions to provide substituted 3‐hydroxyoxindoles in good to excellent
Cu(I)-based chiral catalysts bearing binaphthyl-Proline hybrid ligands and their application in enantioselective Friedel-Crafts reactions of indoles with isatins
作者:Chao Wang、Zilin Jiao、Jiaqi Hou、Jiahui Li、Tianxu Yu、Shibo Yu、Qihang Cai、Chao Yao、Yue-Ming Li
DOI:10.1016/j.tet.2024.133868
日期:2024.3
Highlyenantioselective Friedel-Crafts reactions of indoles with isatins were realized usingchiral Cu(I) catalyst bearing BINOL and proline-based electronically and sterically tunable chiral O–N–N tridentate ligands. Such catalyst system showed excellent performance in enantioselective Friedel-Crafts alkylation of different indoles, and a series of 3-indolyl-3-hydroxyoxindoles were obtained in high