The synthesis of N-aroyl- and N-arylsulfonylisothiazole-2-imines 7c-f as well as the corresponding acceptor-substituted 2-aminoisothiazolium salts 8c-f by cyclocondensation of thiocyanatovinylaldehyde hydrazones 6c-f is reported. The alternative Cyclization route to 1,2,3-thiadiazines is not observed.