Synthesis of 2-Trifluoroacetonyl-3-alkyl/alkoxychromones and Their Reactions with 1,2-Bidentate Nucleophiles
作者:Mykhaylo S. Frasinyuk、Iryna M. Biletska、Galyna P. Mrug、Yaroslav O. Prostota、Kostyantyn M. Kondratyuk、Svitlana P. Bondarenko
DOI:10.3987/com-22-14659
日期:——
3-substituted 2-methyl/2-benzyl/2-(2-phenethyl)chromones with trifluoroacetic anhydride in presence of potassium trifluoroacetate was investigated. It was established that the nature of substituent in position 3 of chromone ring has no crucial influence/limitation on this reaction, whereas only in the case of 2-benzyl substituent (in addition to 2-sec-alkyl group) no reaction was occurred at all. Reaction of
研究了3-取代的2-甲基/2-苄基/2-(2-苯乙基)色酮与三氟乙酸酐在三氟乙酸钾存在下的反应。已确定色酮环 3 位取代基的性质对该反应没有关键影响/限制,而仅在 2-苄基取代基的情况下(除了 2-秒-烷基)根本没有发生反应。合成的 2-(3,3,3-三氟-2-氧代丙基)色酮与二盐酸肼反应得到 3-(2-羟基苯甲酰基)-5-三氟甲基吡唑,但与羟胺反应导致侧链羰基的肟化。2-三氟甲基色酮与 1,2-双齿亲核试剂反应生成取代的 2-羟基苯基吡唑和异恶唑。讨论了这些环转化反应的机理。