Abstract: | The title compound, isothiocyanate 2 , was obtained in good yield from the reaction of α-chloromethylvinyl-sulfone 1 with lead thiocyanate. The isothiocyanate 2 was reacted with aromatic amines to give 2-amino-5,6-dihydro-4H-1,3-thiazines 3 in good to moderate yields. The formation pathways are discussed. |