Radical cation Diels-Alder reaction of indoles and exocyclic dienes
作者:Olaf Wiest、Eberhard Steckhan
DOI:10.1016/0040-4039(93)85053-y
日期:1993.10
A convergent synthesis of [b]-annelated tetrahydrocarbazoles through a radicalcationDiels-Alderreaction is described. The reaction is induced by photo electron transfer (PET). The previously predicted stepwise mechanism of this reaction is proved by stereochemical analysis of the products.
[4 + 2]-Cycloaddition Reactions between β-Acceptor-Substituted Enamines and 2-Vinylindole Radical Cations Acting as Hetero-Dienes
作者:Christoph F. Gürtler、Eberhard Steckhan、Siegfried Blechert
DOI:10.1021/jo951551o
日期:1996.1.1
[4 + 2]-Cycloadditionreactions between 2-vinylindoles acting as hetero-dienes and beta-acceptor substituted cyclic and acyclic enamines can be induced by formation of 2-vinylindole radical cations either via anodic oxidation or photoelectron transfer (PET) using catalytic amounts of triarylpyrylium tetrafluoroborates as sensitizers. In this way, pyrido[1,2-a]indoles or indolo[1,2-a]hexahydro-1,8-naphthyridines
Nucleophilic additions to acceptor-substituted 2-vinylindoles
作者:Siegfired Blechert、Thomas Wirth
DOI:10.1016/0040-4039(91)80485-o
日期:1991.12
1,2-Additions, 1,4-additions and 1,4-additions with subsequent cyclisation to alpha-ethylidene-(Z)-1H-indole-2-acetonitrile 3a yield functionalized 2-substituted indoles, which are attractive intermediates for the synthesis of heterocycles and alkaloids.
Proton-induced Diels-Alder reactions of 2-Vinylindoles
作者:Siegfried Blechert、Thomas Wirth
DOI:10.1016/s0040-4039(00)61001-8
日期:1992.10
New induction methods for the Diels-Alder reaction of acceptor-substituted 2-vinylindoles with carbodienophiles are described. Variation of the diene as well as the dienophile allows regio- and stereocontrolled construction of different carbazole derivatives.