Synthetic Studies on the Benzofuran Derivatives. Part I. A New Synthesis of Karanjin

Abstract
Starting from 7-hydroxy-3-methoxyflavone-8-aldehyde (II), 3-methoxyflavone-7,8-furan-α-carboxylic acid (IV) was synthesised in good yield by the method of Tanaka for benzofuran synthesis and was decarboxylated in quinoline with copper powder into karanjin (I).

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