Rhodium(ii) catalyzed diastereoselective reactions of diazoacetamides with isatins: an efficient approach to 3-hydroxy-3,3′-bioxindoles
作者:Ming Li、Li Zan、Dipak Prajapati、Wenhao Hu
DOI:10.1039/c2ob26580j
日期:——
The 3,3â²-bioxindole derivatives were constructed in a single step via an efficient Rh2(OAc)4 catalyzed reaction of diazoacetamides with isatins. This novel method provides an alternative pathway towards 3-hydroxy-3,3â²-bioxindoles in good yield (up to 78%) with high diastereoselectivity (up to 95â:â5).
Cu(I)-Catalyzed Three-Component Reaction of α-Diazo Amide with Terminal Alkyne and Isatin Ketimine via Electrophilic Trapping of Active Alkynoate-Copper Intermediate
作者:Jiuwei Che、Alavala Gopi Krishna Reddy、Li Niu、Dong Xing、Wenhao Hu
DOI:10.1021/acs.orglett.9b01470
日期:2019.6.21
between terminalalkyne, α-diazo amide, and isatin ketimine is realized by utilizing copper catalysis. A series of alkynyl-containing 3,3-disubstituted oxindoles were synthesized with high efficiency and diastereoselectivity under mild reaction conditions. This transformation is proposed to proceed through a Mannich-type trapping of an alkynoate copper intermediate derived from terminalalkyne and copper
Multicomponent Assembly of Complex Oxindoles by Enantioselective Cooperative Catalysis
作者:Ru‐Yu Hua、Si‐Fan Yu、Xiao‐Ting Jie、Huang Qiu、Wen‐Hao Hu
DOI:10.1002/anie.202213407
日期:2022.12.19
Ternary catalysis enabled the three-component reaction of N-aryl diazoamides, aldehydes, and enamines/indoles, providing access to polyfunctionalized oxindoles in good yields with excellent diastereoselectivities and enantioselectivities (>90 examples, up to 94 % yield, 99 % ee, and >20 : 1 dr). The reaction involves the assembly of two highly reactive intermediates generated in situ by orthogonal
An efficient transition-metal-free fluoroarylation reaction of N-aryl diazoacetamides with NFSI (N-fluorobenzenesulfonimide) is described. This reaction directly provides 3-fluorooxindole derivatives in yields of 67-93% with high selectivity via a carbene-free process under mild reaction conditions.