Synthesis of a new class of carbinol linked bis-heterocycles via the reaction of 2-(trifluoroacetyl)chromones with indoles and pyrroles
摘要:
2-(Trifluoroacetyl)chromones react with indoles at 90 degrees C under solvent-free conditions to produce the target (chromon-2-yl) (indol-3-yl) (trifluoromethyl)carbinols in 69-90% yields. In a similar manner, their reactions with pyrroles under the same conditions gave (chromon-2-yl) (pyrrol-2-yl) (trifluoromethyl) carbinols in 52-95% yields. These chromone derivatives react with 60% hydrazine hydrate in refluxing ethanol to give the corresponding pyrazoles. (C) 2015 Elsevier Ltd. All rights reserved.
Synthesis of a new class of carbinol linked bis-heterocycles via the reaction of 2-(trifluoroacetyl)chromones with indoles and pyrroles
摘要:
2-(Trifluoroacetyl)chromones react with indoles at 90 degrees C under solvent-free conditions to produce the target (chromon-2-yl) (indol-3-yl) (trifluoromethyl)carbinols in 69-90% yields. In a similar manner, their reactions with pyrroles under the same conditions gave (chromon-2-yl) (pyrrol-2-yl) (trifluoromethyl) carbinols in 52-95% yields. These chromone derivatives react with 60% hydrazine hydrate in refluxing ethanol to give the corresponding pyrazoles. (C) 2015 Elsevier Ltd. All rights reserved.
Methyl 2-methoxytetrafluoropropionate as a synthetic equivalent of methyl trifluoropyruvate in the Claisen condensation. The first synthesis of 2-(trifluoroacetyl)chromones and 5-aryl-2-hydroxy-2-(trifluoromethyl)furan-3(2H)-ones
作者:Roman A. Irgashev、Vyacheslav Ya. Sosnovskikh、Nataliya Kalinovich、Olesya Kazakova、Gerd-Volker Röschenthaler
DOI:10.1016/j.tetlet.2009.06.067
日期:2009.8
2-(Trifluoroacetyl)chromones and 5-aryl-2-liydroxy-2-(trifluoromethyl)furan-3(2H)-ones were obtained in good yields via the Claisen condensation of acetophenones with methyl 2-methoxytetrafluoropropionate, followed by sulfuric acid-mediated deprotection of the reaction products. (C) 2009 Elsevier Ltd. All rights reserved.