Journal
TETRAHEDRON LETTERS
Volume 54, Issue 24, Pages 3105-3110Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2013.04.001
Keywords
Lewis acid-surfactant-combined catalyst; Chromeno[4,3-b]chromene; Colloidal aggregates
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Funding
- U.G.C.
- Calcutta University
- U.G.C., New Delhi, India
- DST-FIST, India
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A highly efficient multicomponent heteroannulation protocol for the synthesis of a library of chromeno[4,3-b]chromene derivative has been developed by applying a Lewis acid-surfactant-combined catalyst (LASC) [Fe(DS)(3)]. The LASC converted the initially floating reaction mass into a homogeneous mixture, which on stirring became a turbid emulsion of colloidal aggregates. The shape and size of the colloidal aggregates are confirmed by optical microscopy and DLS. The aqueous reaction medium, dual role of the catalyst in aqueous media, easy recovery of the catalyst, and high yield make the protocol attractive, sustainable, and economical. (C) 2013 Elsevier Ltd. All rights reserved.
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