Potassium Amide-Catalyzed Benzylic C−H Bond Addition of Alkylpyridines to Styrenes
作者:Dan-Dan Zhai、Xiang-Yu Zhang、Yu-Feng Liu、Lei Zheng、Bing-Tao Guan
DOI:10.1002/anie.201710128
日期:2018.2.5
alkylpyridines is an important pathway for pyridine derivatives synthesis. The reaction partners, however, were mostly limited to highly reactive polar electrophiles. Herein, we report a potassium amide‐catalyzed selective benzylic C−H bond addition of alkylpyridines to styrenes. Potassium bis(trimethylsilyl)amide (KHMDS), a readily available Brønsted base, showed excellent catalytic activity and chemoselectivity
烷基吡啶的苄基官能化是吡啶衍生物合成的重要途径。然而,反应伙伴主要限于高反应性的极性亲电试剂。在本文中,我们报道了烷基吡啶向苯乙烯中的钾酰胺催化选择性苄基CH键加成。双(三甲基甲硅烷基)酰胺钾(KHMDS)是一种容易获得的布朗斯台德碱,具有出色的催化活性和化学选择性。以良好或高收率获得了一系列烷基吡啶衍生物,包括苄基季碳取代的吡啶。初步的机理研究表明,去质子平衡可能是造成极好的选择性的原因。