Synthesis of tetrahydro-5-azaindoles and 5-azaindoles using pictet-spengler reaction-appreciable difference in products using different acid catalysts

TitleSynthesis of tetrahydro-5-azaindoles and 5-azaindoles using pictet-spengler reaction-appreciable difference in products using different acid catalysts
Publication TypeJournal Article
Year of Publication2011
AuthorsShumaila, AMA, Puranik, VG, Kusurkar, RS
JournalTetrahedron
Volume67
Issue5
Pagination936-942
Date PublishedFEB
ISSN0040-4020
Keywords2-(Aryl)-2-(1H-pyrrol-2-yl)ethanamines, 4, 7-Disubstituted-5-azaindoles, 7-Disubstituted-tetrahydro-5-azaindoles, Diastereoselective Pictet-Spengler reaction
Abstract

Pictet-Spengler condensation of 2-(aryl)-2-(1H-pyrrol-2-yl)ethanamines using conventional acid catalysts like TMSCl or TFA resulted in the formation of substituted 5-azaindoles involving a tandem one pot four steps reaction sequence. By contrast use of glacial acetic acid furnished the targeted tetrahydro-5-azaindoles in diastereoselective manner. These were readily dehydrogenated to 5-azaindoles. (C) 2010 Elsevier Ltd. All rights reserved.

DOI10.1016/j.tet.2010.12.003
Type of Journal (Indian or Foreign)Foreign
Impact Factor (IF)3.025
Divison category: 
Center for Material Characterization (CMC)