Rhodium(II)-Catalyzed Enantioselective C−H Functionalization of Indoles
摘要:
A catalytic, enantioselective method for the C-H functionalization of indoles by diazo compounds has been achieved. With catalytic amounts of Rh-2(S-NTTL)(4), the putative Rh-carbene intermediates from alpha-alkyl-alpha-diazoesters react with indoles at C(3) to provide alpha-alkyl-alpha-indolylacetates in high yield and enantioselectivity. From DFT calculations, a mechanism is proposed that involves a Rh-ylide intermediate with oxocarbenium character.
Synthesis and Characterization of Donor–Acceptor Iron Porphyrin Carbenes and Their Reactivities in N–H Insertion and Related Three-Component Reaction
作者:Chaoqun Ma、Shang Wang、Yuan Sheng、Xiao-Li Zhao、Dong Xing、Wenhao Hu
DOI:10.1021/jacs.2c12155
日期:2023.3.8
transformations lacks direct evidence. Here we report the synthesis and NMR characterization of several donor–acceptor IPC complexes from iron porphyrin and corresponding donor–acceptor diazo compounds. The X-ray crystal structure of an IPC complex derived from a morpholine-substituted diazo amide was obtained. The carbene transfer reactivities of those IPCs were tested by the N–H insertion reactions
Stereoselective Palladium-Catalyzed Hiyama Cross-Coupling Reaction of Tetrasubstituted <i>gem</i>-Difluoroalkenes
作者:Min Li、Gavin Chit Tsui
DOI:10.1021/acs.orglett.3c04037
日期:2024.1.12
We herein describe a diastereoselective Pd(0)-catalyzed Hiyama cross-coupling reaction of gem-difluoroalkenes. The use of organosiliconreagents in this reaction is advantageous over other organometallic reagents by allowing the introduction of a wide range of functional groups, including challenging alkyl groups. Also conveniently, the additive TBAF was not required for (hetero)aryl-substituted difluoroalkenes
DeAngelis, Andrew; Dmitrenko, Olga; Yap, Glenn P. A., Journal of the American Chemical Society, 2009, vol. 131, p. 7230 - 7231
作者:DeAngelis, Andrew、Dmitrenko, Olga、Yap, Glenn P. A.、Fox, Joseph M.
DOI:——
日期:——
Rhodium(II)-Catalyzed Enantioselective C−H Functionalization of Indoles
作者:Andrew DeAngelis、Valerie W. Shurtleff、Olga Dmitrenko、Joseph M. Fox
DOI:10.1021/ja1093309
日期:2011.2.16
A catalytic, enantioselective method for the C-H functionalization of indoles by diazo compounds has been achieved. With catalytic amounts of Rh-2(S-NTTL)(4), the putative Rh-carbene intermediates from alpha-alkyl-alpha-diazoesters react with indoles at C(3) to provide alpha-alkyl-alpha-indolylacetates in high yield and enantioselectivity. From DFT calculations, a mechanism is proposed that involves a Rh-ylide intermediate with oxocarbenium character.