This paper describes the synthesis of dithioindoles from the free-radical cyclizations of arylisonitriles having pendant alkynes. Also described is the synthesis of substituted indoles and spiro-fused indoles from the coupling of dithioindoles with active hydrogen-containing compounds.
Tandem Hydroformylation/Fischer Indole Synthesis: A Novel and Convenient Approach to Indoles from Olefins
作者:Petra Köhling、Axel M. Schmidt、Peter Eilbracht
DOI:10.1021/ol0350184
日期:2003.9.1
[reaction: see text] A novel one-pot synthesis of indole systems via tandem hydroformylation/Fischer indolesynthesis starting from olefins and arylhydrazines is described. This tandem procedure leads directly to 3-substituted indoles if unsubstituted phenylhydrazine is used and to 3,5- respectively 3,7-disubstituted indoles if para- or ortho-substituted arylhydrazines are used.
The palladium-catalyzed borylative cyclization via C—H activation has been developed. By this chemistry, the indole-fused dihydro-pyrrole motif, which is a kind of important unit in natural products and bio-active molecules, could be constructed and installed with a boric ester group. Furthermore, the utilities of products have been illustrated by the study of further transformations. Importantly,
An isonitrile-alkyne cascade to di-substituted indoles
作者:Jon D. Rainier、Abigail R. Kennedy、Eric Chase
DOI:10.1016/s0040-4039(99)01169-7
日期:1999.8
Intramolecular tin and sulfur mediated free-radical cyclizations between an aryl isonitrile and a pendant TMS-substituted alkyne give 2,3-disubstituted indoles from 5-exo-dig cyclization and nucleophilic trapping of the resulting indolenine intermediate. (C) 1999 Elsevier Science Ltd. All rights reserved.
One-Pot Multicomponent Synthesis of Indoles from 2-Iodobenzoic Acid