期刊
TETRAHEDRON LETTERS
卷 52, 期 1, 页码 69-73出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2010.10.146
关键词
Benzimidazoles; Quinoxalines; K10-Montmorillonite; Clayzic; Lewis acids
资金
- Department of Science and Technology, New Delhi
- Council of Scientific and Industrial Research, New Delhi
A very simple, green and efficient protocol is developed in which zinc chloride-exchanged K10-montmorillonite (clayzic) is employed as a Lewis acid catalyst in aqueous media at room temperature for the synthesis of various benzimidazoles and quinoxalines from carbonyl compounds and o-phenylenediamine. Among the various catalysts (including claycop and Zn2+-Y) studied, clayzic produces benzimidazoles and quinoxalines in higher yield, and with a flexible diamine such as ethylenediamine only the bis-Schiff base is formed. Other salient features of this protocol include milder conditions, atom-economy, absence of coupling agents, and no wastes. (C) 2010 Elsevier Ltd. All rights reserved.
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