Journal
TETRAHEDRON
Volume 57, Issue 48, Pages 9755-9758Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4020(01)00977-2
Keywords
S-acyl(aroy)thiosalicylic acids; (trimethylsilyl)methylenetriphenylphosporane; acylphosphorane; intramolecular Wittig cyclization; thiochromones
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The reaction of silyl ester of S-acyl(aroyl) thiosalicylic acids 3 with (trimethylsilyl)methylenetriphenylphosphorane 4 in step wise fashion leads to the acylphosphoranes 7, which subsequently undergo intramolecular Wittig cyclization on the thiolester carbonyl to afford the 4H-1-benzothiopyran-4-ones 8 in good to excellent yields. (C) 2001 Elsevier Science Ltd. All rights reserved.
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