A NEW COPPER-CATALYZED PATHWAY TO BENZO AND PYRIDYL FUSED IMIDAZO-, TRIAZOLO- AND PYRIMIDO-THIAZINES Eine neue Kupfer-katalysierten Weg zu Benzo und Pyridyl FUSED IMIDAZO-, TRIAZOLO-UND Pyrimido-Thiazine

A simple one flask method for the selective preparation of benzo and pyridyl fused imidazo[2,1-b][1,3]thiazines, [1,2,4]triazolo[5,1-b][1,3]thiazines, and pyrimido[2,1- b][1,3]thiazin-6-ones from corresponding thiols and o-halobenzyl bromides or 2-bromo-3- chloromethylpyridine in the system solid KOH / CuI / TBAB / DMF has been developed.