A New Biarylphosphine Ligand for the Pd-Catalyzed Synthesis of Diaryl Ethers under Mild Conditions
作者:Luca Salvi、Nicole R. Davis、Siraj Z. Ali、Stephen L. Buchwald
DOI:10.1021/ol202955h
日期:2012.1.6
A new bulky biarylphosphine ligand (L8) has been developed that allows the Pd-catalyzed C–O cross-coupling of a wide range of aryl halides and phenols under milder conditions than previously possible. A direct correlation between the size of the ligand substituents in the 2′, 4′, and 6′ positions of the nonphosphine containing ring and the reactivity of the derived catalyst system was observed. Specifically
已经开发出一种新的庞大的联芳基膦配体 ( L8 ),它允许在比以前更温和的条件下,Pd 催化的 C-O 交叉偶联广泛的芳基卤化物和苯酚。观察到含非膦环的 2'、4' 和 6' 位置的配体取代基的大小与衍生催化剂体系的反应性之间存在直接相关性。具体而言,偶联速率随着这些取代基的大小而增加。