Heterocyclization of dithiocarbamates and thioureas of the imidazole series with dimethylacetylenedicarboxylate

A heterocyclic system of imidazo[1,5-c][1,3,5]thiadiazine was synthesised by the interaction of polyfunctional imidazolyl thioureas and ethyldithiocarbamates with dimethylacetylenedicarboxylate.