[EN] PREPARATION AND APPLICATIONS OF POLYMER-SUPPORTED HALOGENATED BENZOQUINONES AS OXIDATIVE AGENTS<br/>[FR] PREPARATION ET APPLICATIONS DE BENZOQUINONES HALOGENEES SUPPORTEES PAR POLYMERE EN TANT QU'AGENTS OXYDANTS
申请人:COULADOUROS ELIAS
公开号:WO2005121077A1
公开(公告)日:2005-12-22
This invention provides a general method for the synthesis of polymer-supported benzoquinones described by the following generic structure I: wherein: •, X, R1, R2 and R3 are described in the main text. The general concept of the method consists of the use of a halogenated starting material of the general structure II (Figure 1) which by an nucleophilic substitution reaction (NSR) or a palladium mediated coupling (PMC) is either directly loaded on a resin to afford IIIa (Path A) or transformed to intermediate IIIb (Path B) which is subsequently (with or without modification) loaded on a resin to afford once again IIIa. Deprotection and/or oxidation of IIIa, if needed, afford target solid-supported oxidants I The polymer-supported benzoquinones I are used for the oxidation of hydroquinones to quinones, for the oxidation of benzylic alcohols the aldehydes, for the removal of p-methoxybenzyl and related protective groups, for the dehydrogenation of tetrahydronaphthalene derivatives and for the dehydrogenation of steroid 4-en-3-ones. The polymer-supported reagent after its use is regenerated upon treatment with an oxidative agent.
这项发明提供了一种合成聚合物支持苯醌的通用方法,其结构如下所示:其中:•,X,R1,R2和R3在正文中描述。该方法的一般概念包括使用一种卤代起始物质II的通用结构(图1),通过亲核取代反应(NSR)或钯介导的偶联反应(PMC),直接加载到树脂上以得到IIIa(路径A),或转化为中间体IIIb(路径B),随后(带或不带修饰)加载到树脂上再次得到IIIa。如果需要,对IIIa进行去保护和/或氧化,得到目标固体支持氧化剂I。聚合物支持的苯醌I用于将对氢醌氧化为醌,将苄基醇氧化为醛,去除对甲氧基苄和相关保护基,脱氢四氢萘衍生物以及类固醇4-烯-3-酮的脱氢。使用后,聚合物支持试剂经过氧化剂处理后可以再生。