Journal
TETRAHEDRON LETTERS
Volume 48, Issue 31, Pages 5371-5374Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.06.036
Keywords
alpha-bromoketone; 1,2-diamine; HClO4 center dot SiO2; cyclizationoxidation; processes; quinoxaline; dihydropyrazine; heterogeneous; recyclable catalyst
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A convenient and straightforward method has been developed for the synthesis of quinoxalines and dihydropyrazines (DHPs) using alpha-bromo ketones and 1,2-diamines in the presence of silica supported perchloric acid (HClO4 center dot SiO2) at room temperature. The quinoxalines and DHPs were presumably formed via cyclization-oxidation. The catalyst works under heterogeneous conditions and can be recycled. (c) 2007 Elsevier Ltd. All rights reserved.
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