作者:Waldemar Adam、Joachim Bialas、Lazaros Hadjiarapoglou、Támas Patonay
DOI:10.1055/s-1992-34184
日期:——
The synthesis of α,β-epoxy-2′-hydroxychalcones (3-aryl-2,3-epoxy-1-(2-hydroxyaryl)propanones) 2 by direct epoxidation of (E)-2′-hydroxychalcones [(E)-3-aryl-1-(2-hydroxyaryl)propenone] 1 with dimethyldioxirane at subambient temperatures is reported. These acid- and base-sensitive epoxides, which have been hitherto difficult to prepare, were isolated in excellent yields and were completely characterized by spectral and microanalytical data. The now readily available 2′-hydroxy substituted chalcone oxides may serve as convenient precursors to flavonoid-type natural products.
通过直接环氧化 (E)-2′-羟基查尔酮 [(E) 合成 α,β-环氧-2′-羟基查尔酮 (3-芳基-2,3-环氧-1-(2-羟基芳基)丙酮) 2据报道,在低于环境温度下,用二甲基二环氧乙烷制备)-3-芳基-1-(2-羟基芳基)丙烯酮] 1 。这些迄今为止难以制备的对酸和碱敏感的环氧化物以优异的产率分离出来,并通过光谱和微量分析数据进行了完全表征。现在容易获得的2'-羟基取代的查尔酮氧化物可以作为黄酮类天然产物的方便前体。