Flavonoid epoxides. Part 20. Some unusual reactions of dimethyldioxirane (DMD) with flavonoid compounds
作者:Anthony J. Burke、W. Ivo O'Sullivan
DOI:10.1016/s0040-4020(97)00506-1
日期:1997.6
either the 2′-hydroxychalcone epoxide or the trans-2,3-dihydroflavonol could be obtained depending on the pH of the reaction mixture and the type of β-arene ring present in the substrate. Using this methodology trans-2,3-dihydroflavonols can be synthesised in far better yields than by the most commonly used method for their synthesis, that of the Algar-Flynn-Oyamada reaction. Treatment of both flavonol
二甲基二环氧乙烷(DMD)通常以丙酮溶液的形式被证明是一种极好的环氧化剂。观察到,取决于反应混合物的pH和底物中存在的β-芳烃环的类型,可以得到2'-羟基查耳酮环氧化物或反式-2,3-二氢黄酮醇。使用这种方法,与通过最常用的Algar-Flynn-Oyamada反应合成方法相比,合成反式-2,3-二氢黄酮醇的产率要好得多。用DMD处理黄酮醇14和新型异金酮21均得到不同寻常的产物,而不是预期的环氧化物,但是,假定在反应过程中形成了环氧化物。