Reactions of 4-Propargylsulfanylquinazoline with Bromine and Iodine

Cyclization of 4-propargylsulfanylquinazoline under the action of iodine gave 3-iodomethyl[1,3]thiazolo[3,2-c]-quinazolinium triiodide, which is reduced with sodium iodide to form 3-methyl[1,3]thiazolo[3,2-c]quinazolinium iodide. The reaction with bromine in dichloromethane leads to the formation of 3-bromomethyl[1,3]thiazolo-[3,2-c]quinazolinium bromide, and in acetic acid—2-(2-aminophenyl)-4-dibromomethyl-1,3-thiazole hydrobromide.