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Sequential treatment of 5-bromo-2,4-dichloro-6-(chloromethyl)pyrimidine with 2-aminothiophenol and secondary amines afforded a series of 2-[(5-bromo-2-chloro-6-aminopyrimidin-4-yl)methylthio]aniline derivatives. Reaction of the latter compounds with secondary amines in ethanol gave a family of new 5,7-diamino-5,11-dihydropyrimido[5,4- e ][1,4]benzothiazepines.

Synthesis of a novel fused tricyclic heterocycle, pyrimido[5,4- e ][1,4]thiazepine, and its derivatives