Acid-promoted oxidative methylenation of 1,3-dicarbonyl compounds with DMSO: application to the three-component synthesis of Hantzsch-type pyridines

A series of polysubstituted pyridines and methylene-bridged bis-1,3-dicarbonyl compounds were prepared in high yields from 1,3-dicarbonyl compounds and DMSO, wherein DMSO serves as solvent, carbon source, and oxidant.