作者:John A. Donnelly、John R. Keegan、Killian Quigley
DOI:10.1016/s0040-4020(01)83137-9
日期:1980.1
Chromones and isoflavones, but not flavones, were epoxidized by alkaline hydrogen peroxide. 3-Substituted chromone epoxides were considerably more stable than others; one isoflavone epoxide was converted into a fluorohydrin, another into a 1,2-diol. The latter is a 2-hydroxychromanone and a similarly structured compound was obtained by the cyclisation of 2'-benzoyloxy-2,2-dibromoacetophenone. Acid-catalysed
碱性过氧化氢将色酮和异黄酮(而不是黄酮)环氧化。3-取代的色酮环氧化物比其他化合物稳定得多。一种异黄酮环氧化物被转化为氟代醇,另一种转化为1,2-二醇。后者是2-羟基苯并二氢吡喃酮,并且通过2′-苯甲酰氧基-2,2-二溴苯乙酮的环化获得类似结构的化合物。色酮环氧化物的酸催化开环发生区域选择性产生3-羟基色氨酸。碱催化的开环也选择性地在3-位发生。酸和碱催化的2-甲基-异黄酮环氧化物的水解导致两个杂环的裂解,分别产生1,3-和1,2-二酮。该环氧化物与硫酸形成环状硫酸盐。