Journal of Heterocyclic Chemistry p. 1185 - 1188 (2014)
Update date:2022-08-05
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The synthesis of various amide and ester derivatives of naphthopyrone-2-carboxylic acid has been carried out by reaction of 1-naphthol with dimethyl acetylenedicarboxylate, which gave a mixture of E and Z isomers of naphthoxy diester. The diester on hydrolysis with KOH gave corresponding diacid, which was a mixture of E and Z isomers. The E and Z isomers were difficult to separate, which were subjected to cyclization in sulfuric acid to get cyclized naphthopyrone carboxylic acid. This acid is converted into titled compounds.
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