Abstract
Abstract 3-Acetyl coumarins I react with substituted sulfanilamides in the presence of iodine to give substituted 3-(2-arylamino-4-thiazolyl)-2H-1-benzopyran-2-ones (II). The structures of these compounds have been confirmed and they were converted into their acetyl derivatives (III). Condensation of various 3-(ω-bromoacetyl)-2H-1-benzopyran-2-ones (IV) with rubenic acid in the presence of anhydrous ethanol and dimethyl formamide yielded 3,3′[2,2′-bithiazole]-4,4′-dylbis-[2H-1-benzopyran-2-one] (V). The structural assignment of these products is based on the elemental analyses and spectral (IR, PMR and MS) data.
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