Journal
TETRAHEDRON LETTERS
Volume 54, Issue 8, Pages 1003-1007Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2012.12.041
Keywords
Graphite; Green chemistry; Quinoxalines
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Funding
- Department of Science and Technology (DST)
- Council for Scientific and Industrial Research (CSIR), New Delhi
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A new simple approach using environmentally benign, cheap, and easily recyclable graphite as a heterogeneous catalyst for the synthesis of quinoxalines is described. A library of pharmacologically interesting diphenylquinoxalines is prepared by the double condensation of substituted benzils, phenanthrene-9,10-dione, and benzoin with aromatic diamines in 71-93% yields at room temperature in ethanol. Aliphatic diamines gave corresponding dihydropyrazines from substituted benzils in 72-92% yields. (C) 2012 Elsevier Ltd. All rights reserved.
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