Journal
TETRAHEDRON LETTERS
Volume 49, Issue 21, Pages 3437-3440Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2008.03.111
Keywords
copper catalyst; multi-component reaction; benzofuran; alkynylsilane
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The combination of 5 mol % Cu(OTf)(2) and CuCl in the presence of DMAP effectively catalyzed a three-component coupling reaction involving an alkynylsilane, an o-hydroxybenzaldehyde derivative, and a secondary amine. The reaction proceeded via intramolecular 5-exo-dig cyclization, resulting in direct synthesis of the corresponding benzofuran derivatives in moderate to excellent yields. (C) 2008 Elsevier Ltd. All rights reserved.
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