Chelation-Mediated Facially Selective Cycloaddition Reactions of 2-Formyl-2-methyl-1,3-dithiane 1-Oxides

Abstract
2-Formyl-2-methyl-1,3-dithiane 1-oxides undergo very highly diastereoselective heterocycloaddition reactions with Danishefsky's diene (E-1-methoxy-3-trimethylsilyloxy-1,3-butadiene) mediated by magnesium bromide to give after mild acidic work-up 2-(3,4-dihydro-4-oxo-2H-pyran-2-yl)-2-methyl-1,3-dithiane 1-oxides.

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