Synthetic Studies Towards the Preparation of 2-Benzyl-2- hydroxybenzofuran-3(2<i>H</i>)-one, the Prototype of Naturally Occurring Hydrated Auronols
作者:Reik Löser、Marta Chlupacova、Ales Marecek、Veronika Opletalova、Michael Gütschow
DOI:10.1002/hlca.200490232
日期:2004.10
(8), the prototype of naturally occurring auronols. While the base-induced ring transformation of 3-hydroxyflavanone (2) as well as the hydration of 2-benzylidenebenzofuran-3(2H)-one (=aurone; 6) proved to be inappropriate, the hydrogenolytic epoxide-ring opening of 2′-phenylspiro[benzofuran-2(3H),2′-oxiran]-3-one (7), obtained from 6, represents an efficient method to afford the auronol 8.
各种合成方法用于制备2-苄基-2-羟基苯并呋喃-3(2 H)-one(8),这是天然存在的金龙酚的原型。虽然碱诱导的3-羟基黄酮(2)的环转化以及2-苄叉基苯并呋喃3(2 H)-一(= aurone; 6)的水合被证明是不合适的,但2的氢解环的开环从6获得的'-苯基螺并[benzofuran-2(3 H),2'-环氧乙烷] -3-one(7)代表了一种提供金红石8的有效方法。