Synthesis of 2 (3)-ethoxycarbonyl-5, 6, 7, 8-tetrafluorochromones
VI Saloutin, ZE Skryabina, IT Bazyl…
Index: Saloutin, V. I.; Skryabina, Z. E.; Bazyl, I. T.; Chupakhin, O. N. Russian Chemical Bulletin, 1993 , vol. 42, # 2 p. 322 - 325 Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1993 , # 2 p. 362 - 364
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Abstract
Abstract The hitherto unknown ethyl pentafluorobenzoylpiruvate was prepared by condensing pentafluoroacetophenone with diethyl oxalate. Intramolecular cyclization of this ester or of its copper (II) chelate, as well as of ethyl 2-(ethoxymethylene) pentafluorobenzoylacetate affords 2-and 3-ethoxycarbonyl-5, 6, 7, 8-tetrafluorochromones. Hydrolysis of the latter followed by decarboxylation gives 5, 6, 7, 8-tetrafluorochromone.
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