It is well known, that sulfur ylides react with carbonyl groups or with electron deficient carbon-carbon double bond in a two-step reaction to afford epoxide or cyclopropanes, respectively. Sulfur ylide in situ generated by treatment of ethyl dimethyl sulfonium acetate bromide with DBU, were reacted with ab cyclic enones, chiral enones and with N-enoyl oxazolidinones in presence of Lewis acids are reported in the literature.