Abstract
The reaction of 3-amino-3-methylthio-2-cyanoacrylonitrile (1) with excess dimethyl acetylenedicarboxylate(DMAD) in the presence of potassium carbonate in dimethyI sulfoxide gave a novel tricyclic heterocycle, hexamethyl IH-1,4,7-triazaphenalene-2,3,5,6,8,9-hexacarboxylate (5). When one equivalent of DMAD was used in this reaction, dimethyl 4-amino-3-cyano-2-methylthio-pyridine-5,6-dicarboxylate (3), a key intermediate of 5, was obtained
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