Journal
TETRAHEDRON LETTERS
Volume 46, Issue 40, Pages 6843-6846Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2005.08.017
Keywords
sulfur extrusion; benzothiadiazole
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A new simple and efficient methodology for reductive sulfur extrusion from 2,1,3-benzothiadiazole compounds has been developed using NaBH4 in the presence of catalytic amounts of ClCl2-6H(2)O (1 mol %). This method is an efficient alternative for the generation of various 1,4-disubstituted-2,3-diaminobenzene derivatives from 4,7-disubstituted-2,1,3-benzothiadiazoles. The diamines can be easily converted into 4,7-disubstitttted-quinoxaline compounds by simple reaction with glyoxal-sodium bisulfite. (c) 2005 Elsevier Ltd. All rights reserved.
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