Journal
TETRAHEDRON
Volume 69, Issue 33, Pages 6861-6865Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2013.06.011
Keywords
3-Substituted chromones; 1H-Benzimidazol-2-ylacetonitrile; Pyrido[1,2-a]benzimidazole; RORC reactions; Michael addition
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A simple and convenient synthesis of a novel series of pyrido[1,2-a]benzimidazoles was efficiently achieved from the condensation reactions of 1H-benzimidazol-2-ylacetonitrile (1) with some 3-substituted chromones, chromone-3-carboxylic acids, chromone-3-carboxamides, ethyl chromone-3-carboxylates and chromone-3-carbonitriles. Reaction of compound 1 with 2-aminochromone-3-carboxaldehydes produced 2-amino-3-(1H-benzimidazol-2-yl)chromeno[2,3-b]pyridines. The reaction mechanisms and spectral data were also discussed. (C) 2013 Elsevier Ltd. All rights reserved.
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