A series of 1,3-dithiol-2-onederivativesvia [4 + 2] Diels–Alder cycloaddition reaction of 4,5-bis(dibromomethyl)-1,3-dithiol-2-one with vinyl-substituted compounds have been synthesized. Structures of all the newly synthesized compounds are well supported by spectral data such as 1H-NMR, MS, and elemental analysis. The structures of and have been analyzed by X-ray crystallography.