New route to 2-cyanobenzothiazoles viaN-arylimino-1,2,3-dithiazoles†
Abstract
N-Arylimino-1,2,3-dithiazole derivatives 2 of 2-bromoanilines are converted in high yield into 2-cyanobenzothiazoles 3 by heating or, more rapidly, by focused microwave irradiation at atmospheric pressure, in pyridine containing cuprous iodide.