Halocyclization of products of allyl isothiocyanate addition to acyclic methylene active compounds

Products of allyl isothiocyanate addition to methylene active compounds, salt-like N-allyl-N,S-ketenacetals or N-allylthioamides, react with iodine, bromine or N-bromosuccinimide with the formation of derivatives of 2-ylidene-5-halomethylthiazolidines. A dependence was found of isomeric composition of obtained thiazolidines on the solvent nature.