The First Synthesis of 4-Unsubstituted 3-(Trifluoroacetyl)coumarins by the Knoevenagel Condensation of Salicylaldehydes with Ethyl Trifluoroacetoacetate Followed by Chromene-Coumarin Recyclization
Dmitrii L. Chizhov, Vyacheslav Ya. Sosnovskikh, Marina V. Pryadeina, Yanina V. Burgart, Victor I. Saloutin, Valery N. Charushin
Synlett 2008: 281-285
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http://dx.doi.org/10.1055/s-2007-1000867