Tetrahedron

A new synthesis of 4H-1-benzothiopyran-4-ones using (trimethylsilyl) methylenetriphenylphosphorane

P Kumar, MS Bodas

文献索引：Kumar, Pradeep; Bodas, Mandar S Tetrahedron, 2001 , vol. 57, # 48 p. 9755 - 9758

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被引用次数: 26

摘要

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.