Abstract 2-Bromomethylphenyl isothiocyanate reacts with pyridine to yield 2- isothiocyanatobenzylpyridinium bromide, which afforded N-aryl-N'-(2-benzylpyridinium) thiourea bromides. Deprotonization of the latter with aqueous NaOH gave N-aryl-N'-(2- benzylpyridinium) thioureates; these freed pyridine upon heating to give 2-arylamino-4H- benzo [d][1, 3] thiazines. Structure of these compounds was evidenced by IR, 1 H, 13 C ...
