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Cyclic Sulfenylcarboxylates from 4H-3,1-Benzoxathiin-4-one 1-Oxides. A New Ring Contraction Reaction
Krische, Bernd,Walter, Wolfgang
, p. 1708 - 1727 (2007/10/02)
4H-3,1-Benzoxathiin-4-one 1-oxides 4 eliminate aldehydes on heating.Corresponding to the substituent in 8-position, ring contraction occurs to give 3H-2,1-benzoxathiol-3-ones 2 or 3H-1,2-benzisothiazol-3-ones 8.The dependance on the substituents and the mechanism of the reaction are discussed.
