An efficient synthesis of geminal di-sulfones

A simple and efficient method for the synthesis of gem-disulfones is reported. This method is based on protection of one of the central acidic hydrogens of bis(methylsulfonyl)methane as a thioether followed by formation of the dianion and selective alkylation of the methyl group. Alkylation of one of the methyl groups was demonstrated as well as alkylation of both methyl groups with the same or different alkyl groups. Removal of the thioether moiety furnished the desired substituted disulfones.