New Syntheses of 3-Aroylflavone Derivatives; Knoevenagel Condensation and Oxidation versus One-Pot Synthesis

[摘要]：Two syntheses of 3-aroylflavones have been established. In the first synthesis the use of microwave irradiation led to an improvement in the yields of both the Knoevenagel condensation of beta-diketones with aldehydes to afford 3-aroylflavanones and of their oxidation to 3-aroylflavones. In the second and more general synthesis, a novel and efficient procedure for 3-aroylflavones involves a one-pot reaction between 2'-hydroxyacetophenones and aroyl chlorides in the presence of lithium bis(trimethylsilyl)amide.

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