Abstract
AbstractThe Reaction of Methyl 3‐Amino‐4‐cyano‐5‐methylthiothiophene‐2‐carboxylate (2), which was prepared by the reaction of bis(methylthio)methylenepropanedinitrile (1) with methyl thioglycolate followed by dimethyl acetylenedicarboxylate (DMAD) in the presence of potassium carbonate in dimethyl sulfoxide gave the polyfunctionalized quinoline, pentamethyl 4‐amino‐5‐mercaptoquinoline‐2,3,6,7,8‐pentacarbox‐ylate (3). The oxidation of 3 with iodine in DMSO provided the novel ring system in the form of the derivative, pentamethyl 2H‐isothiazolo[3,4,5‐de]quinoline‐3,4,6,7,8‐pentacarboxylate (4).
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