General Chemoselective Suzuki–Miyaura Coupling of Polyhalogenated Aryl Triflates Enabled by an Alkyl-Heteroaryl-Based Phosphine Ligand
作者:Chau Ming So、On Ying Yuen、Shan Shan Ng、Zicong Chen
DOI:10.1021/acscatal.1c02146
日期:2021.7.2
describes a general chemoselective Suzuki–Miyaura coupling of polyhalogenated aryl triflates with the reactivity order of C–Cl > C–OTf using a Pd/L33 catalyst. The methine hydrogen and the steric hindrance offered by the alkyl bottom ring of L33 were found to be key factors in reactivity and chemoselectivity. With the Pd/L33 catalyst, a wide range of polyhalogenated (hetero)aryl triflates, which were independent
本研究描述了多卤化芳基三氟甲磺酸酯的一般化学选择性 Suzuki-Miyaura 偶联,反应性顺序为 C-Cl > C-OTf,使用 Pd/ L33催化剂。发现L33的烷基底环提供的次甲基氢和位阻是反应性和化学选择性的关键因素。使用 Pd/ L33催化剂,范围广泛的多卤化(杂)芳基三氟甲磺酸酯,它们与底物和竞争反应位点的相对位置无关,与(杂)芳基、烯基和烷基硼酸很好地偶联,以获得具有良好性能的相应产物。化学选择性和产率。化学选择性反应可以很容易地放大到克级,并且可以使用百万分之几的 Pd 催化剂(低至 10 ppm Pd)。