Enantioselective Gold-Catalyzed Allylic Alkylation of Indoles with Alcohols: An Efficient Route to Functionalized Tetrahydrocarbazoles
作者:Marco Bandini、Astrid Eichholzer
DOI:10.1002/anie.200904388
日期:2009.12.7
Breaking the taboo: The direct use of allylicalcohols in catalytic and enantioselective Friedel–Crafts alkylation is described for the first time in the presence of chiral gold complexes. This intramolecular Friedel–Crafts reaction was used to prepare a broad range of functionalized tetrahydrocarbazoles (see scheme; X=Me, F, Br, Cl, OMe; R=Me, Et, tBu; R′=H, Me).
打破禁忌:在手性金配合物的存在下,首次首次描述了在催化和对映选择性的Friedel-Crafts烷基化反应中直接使用烯丙醇。该分子内Friedel-Crafts反应用于制备范围广泛的官能化四氢咔唑(参见方案; X = Me,F,Br,Cl,OMe; R = Me,Et,t Bu; R'= H,Me)。
Palladium(0)-Catalyzed Dearomative Arylation of Indoles: Convenient Access to Spiroindolenine Derivatives
作者:Ke-Jia Wu、Li-Xin Dai、Shu-Li You
DOI:10.1021/ol301663h
日期:2012.7.20
Dearomatization of an indole via palladium(0)-catalyzed cross-coupling reaction has been realized. With readily available triphenylphosphine as ligand, various spiroindolenine derivatives have been obtained in good to excellent yields, and enantioselective control is also feasible with chiral ligands.
Enantioselective Synthesis of Spiro Cyclopentane-1,3′-indoles and 2,3,4,9-Tetrahydro-1H-carbazoles by Iridium-Catalyzed Allylic Dearomatization and Stereospecific Migration
作者:Qing-Feng Wu、Chao Zheng、Shu-Li You
DOI:10.1002/anie.201107677
日期:2012.2.13
Rings with a twist: The highly enantioselective construction of five‐membered spiroindolenines has been realized by the iridium‐catalyzed intramolecularallylicdearomatization of indoles. The stereospecific migration of these spiro cyclopentane‐1,3′‐indole products provides enantioenriched 2,3,4,9‐tetrahydro‐1H‐carbazoles.
Chiral Brønsted Acid-Catalyzed Intramolecular Asymmetric Allylic Alkylation of Indoles with Primary Alcohols
作者:Lei-Ming Zou、Xian-Yun Huang、Chao Zheng、Yuan-Zheng Cheng、Shu-Li You
DOI:10.1021/acs.orglett.2c01253
日期:2022.5.20
Herein, chiral Brønsted acid-catalyzed intramolecularasymmetricallylicalkylation of indoles with allylic primary alcohols is described. The allyl alcohols were directly employed as the allylic precursors in this metal-free protocol, without preactivation or any additional activating reagents. This method provides the convenient synthesis of a broad range of functionalized tetrahydrocarbazoles in
Synthesis of cyclohepta[b]indoles via gold mediated energy transfer photocatalysis
作者:Yuan Zhao、Vladislav A. Voloshkin、Ekaterina A. Martynova、Bholanath Maity、Luigi Cavallo、Steven P. Nolan
DOI:10.1039/d4cc00379a
日期:——
Gold photocatalyst has been employed as sensitizer for the synthesis of cyclohepta[b]indoles. Substrate scope and limitations of the protocol are presented. Mechanistic studies indicate involvement of EnT-HAT mechanism.