Intra- and Intermolecular Reactions of Indoles with Alkynes Catalyzed by Gold
作者:Catalina Ferrer、Catelijne H. M. Amijs、Antonio M. Echavarren
DOI:10.1002/chem.200601324
日期:2007.2.2
Indoles react intramolecularly with alkynes in the presence of gold catalysts to give fromsix- to eight-membered-ring annulated compounds. The cationic Au(I) complex [Au(PC(6)H(4)(o-Ph)}(tBu)(2))(NCMe)]SbF(6) is the best catalyst for the formation of six- and seven-membered rings by 6-endo-dig, 6-exo-dig, and 7-exo-dig cyclizations. Indoloazocines are selectively obtained with AuCl(3) as catalyst
PtCl<sub>4</sub>-Catalyzed Cyclization Reaction of β-Allenols in the Presence of Indoles
作者:Wangqing Kong、Jie Cui、Yihua Yu、Guofei Chen、Chunling Fu、Shengming Ma
DOI:10.1021/ol802838v
日期:2009.3.19
The highly regioselective PtCl4-catalyzed reaction of indoles with beta-allenols in THF at room temperature afforded indole derivatives containing a six-membered ether ring at the 3-position in moderate isolated yields. On the basis of a D-labeling experiment, a mechanistic rationale was proposed.
Gold(I)-catalyzed one-pot reaction between 2-alkynylanilines and alkynols leading to the formation of C-3-substituted indoles: a case of formal carboamination of alkynes
作者:Nitin T. Patil、Vipender Singh、Ashok Konala、Anil Kumar Mutyala
DOI:10.1016/j.tetlet.2010.01.036
日期:2010.3
A process involving gold(I)-catalyzed formal carboamination of alkynes for the synthesis of C-3-substituted indoles has been developed. The procedure utilizes easily accessible starting materials such as 2-alkynylanilines and alkynols. A series of C-3-functionalized indoles are accessible by using this one-pot strategy. Mechanistically, the reaction involves three catalytic cycles and each of them is essentially catalyzed by a single metal catalyst, that is, Ph3PAuOTf. (C) 2010 Published by Elsevier Ltd.
An Ir-Pt Catalyst for the Multistep Preparation of Functionalized Indoles from the Reaction of Amino Alcohols and Alkynyl Alcohols
作者:Alessandro Zanardi、Jose A. Mata、Eduardo Peris
DOI:10.1002/chem.201001180
日期:2010.11.22
combination of an iridium‐mediated oxidative cyclization of 2‐(ortho‐aminophenyl)ethanol to form indoles, with a further step employing a Pt‐based multistep reaction that functionalizes indoles. Our results show that the Ir–Pt complex is a very active catalyst in this new multistep preparation of functionalized indolesfrom the reaction of an amino alcohol with alkynyl alcohols.