Cobalt-Catalyzed Selective Dearomatization of Pyridines to <i>N</i>–H 1,4-Dihydropyridines
作者:Maofu Pang、Le-Le Shi、Yufang Xie、Tianyi Geng、Lan Liu、Rong-Zhen Liao、Chen-Ho Tung、Wenguang Wang
DOI:10.1021/acscatal.2c00271
日期:2022.5.6
Catalytic reduction of pyridines to N–H 1,4-dihydropyridines is exceptionally challenging because they are essential intermediates to form tetrahydropyridines. Using a facile dihydrogen source H3N·BH3 to activate the pyridine ring in situ, we have achieved selective transfer hydrogenation of nicotinate derivatives to N–H 1,4-dihydropyridines by cobalt-amido cooperative catalysis. The reactions operate
将吡啶催化还原为N -H 1,4-二氢吡啶非常具有挑战性,因为它们是形成四氢吡啶的必要中间体。使用简便的二氢源H 3 N·BH 3原位活化吡啶环,我们通过钴-氨基协同催化实现了烟酸酯衍生物的选择性转移氢化为N -H 1,4-二氢吡啶。该反应在温和条件下顺利进行,以产生各种具有高化学选择性和区域选择性的N -H 1,4-二氢吡啶。这种催化方法还提供了在 H 2递送后再生 Hantzsch 类似物的实用方案。