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Heterocyclic Letters 2013
SYNTHESIS OF 3-CARBOXYCOUMARINS USING PHASE TRANSFER CATALYSIS Synthese von 3-CARBOXYCOUMARINS VERWENDUNG PhasentransferkatalyseKeywords: 3-Carboxycoumarins , ethylcoumarin-3-carboxylate , phase transfer catalysis , salicylaldehyde , diethylmalonate Abstract: The condensation of suitably substituted salicylaldehydes with diethylmalonate in biphase medium using phase transfer catalyst results in to the formation of ethylcoumarin-3-carboxylates. Ethylcoumarin-3-carboxylates so formed on hydrolysis gives coumarin-3-carboxylic acid in high yield.
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