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In this article, we describe the synthesis of various substituted Chromene-[1, 3]thiazolo [2, 1, 3] benzothiadiazoles 4a-l by conventional (Method A) and microwave-assisted (Method B) which achieved reductions in reaction times, higher yields, and a cleaner reaction than the conventional method. A comparative study of these two methods has been discussed.

The formation of title compounds (IV) is assumed to proceed via Michael type addition, followed by aminolysis of the oxadiazine to an unstable open chain intermediate which undergoes dehydrative cyclization to (IV).