Sulfine Chemistry

Abstract
Sulfines (thione S-oxides) are non-linear sulfur-centered heterocumulenes with the general structure XY=SO. In the introduction the various approaches to the synthesis of sulfines and their reactions are briefly reviewed. In a separate section attention is given to the preparation of sulfines using of the reaction of sulfur dioxide with α-silyl carbanions (the modified Peterson reaction). This method provides an access to chiral sulfines, which are interesting partners in asymmetric cycloaddition reactions with dienes. The preparation of α-oxo sulfines from α-methylene ketones, or the corresponding silyl enol ethers, and thionyl chloride is also treated in some detail. These α-oxo sulfines readily undergo cycloaddition reactions with dienes to yield various sulfur-containing heterocycles.

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