Synthesis of pyrimido[4′,5′:5,6][1,4]dithiepino[2,3-b]quinoxalines: Derivatives of a novel seven membered ring system

<p></p> <p>A convenient and efficient procedure for the synthesis of tetracyclic dithiepin derivatives is described through the condensation reaction of 2,4-dichloro-5-(chloromethyl)-6- methylpyrimidine and quinoxaline-2,3-dithiol followed by treatment with secondary amines.</p