Anodic functionalization of vinyl sulfides. Formal access to gem or vicinal aryl thioether dications
作者:Didier F Andres、Eliane G Laurent、Bernard S Marquet、Hassiba Benotmane、Abdelkader Bensadat
DOI:10.1016/0040-4020(95)00009-w
日期:1995.2
clearly show that the reactivity of the vinyl sulfide radical cation depends on several factors as structure of substrates and nucleophilic conditions. For example a dimerization occurred from the unsubstituted vinyl sulfide 1a (CH2=CH-SPh) whereas α,β- and/or β,β-difluoro sulfides were obtained from substituted homologues. In order to understand this reactivity the anodic behaviour of 1a and 1b (Ph-CH=CH-SPh)
许多乙烯基硫醚的阳极氧化已在CH 3 CN-Et 3 N,3HF中进行。结果清楚地表明,乙烯基硫化物自由基阳离子的反应性取决于多种因素,如底物的结构和亲核条件。例如,未取代的乙烯基硫化物1a(CH 2= CH-SPh)发生了二聚,而α,β-和/或β,β-二氟硫化物是从取代的同系物获得的。为了理解这种反应性,已经特别在另外两种亲核介质(CH 3 OH / Et 3)中分析了1a和1b(Ph-CH = CH-SPh)的阳极行为。N,3HF和AcOH / AcOK)分别导致起始化合物的甲氧基化和乙酰氧基化。与电氟化结果的比较使我们能够提出一种涉及中间epi离子的机理,该机理可以解释分离产物的形成和比例。