Palladium-Catalyzed Remote<i>ortho</i>-CH Alkenylation of Alkyl Aryl Sulfones: Access to Densely Functionalized Indane Derivatives
作者:Pablo D. Legarda、Alfonso García-Rubia、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1002/adsc.201501129
日期:2016.3.31
A practical method for the palladium‐catalyzed ortho‐olefination of benzyl and phenethyl 2‐pyridyl sulfones with electron‐deficient alkenes using N‐fluoro‐2,4,6‐trimethylpyridinium triflate ([F+]) as the terminal oxidant is described. The chelating auxiliary (2‐pyridyl)sulfonyl unit was demonstrated to be the key to the success of this reaction, which occurs efficiently with excellent regioselectivity
为一种实用方法的钯-催化的邻位苄基和苯乙基的-olefination 2-吡啶基砜用缺电子烯烃ñ -氟-2,4,6-三甲基三氟甲磺酸酯([F +])作为末端氧化剂被描述。螯合辅助(2-吡啶基)磺酰基单元被证明是该反应成功的关键,该反应以优异的区域选择性和单取代选择性而有效地发生。容许对两个偶联配偶体的各种空间和电子变化,包括在砜化合物的苄基位置处的取代。此外,使用非外消旋底物时,未观察到对映体纯度的明显下降。该方法提供了获得具有高非对映控制性的三个连续的立体异构中心的茚满衍生物的途径。茚满骨架是通过将α-磺酰基碳负离子分子内迈克尔加成到亲电子烯烃上而构建的。