Functionalized α-keto stabilized sulfonium ylides as highly active ligand precursors for palladium catalyzed Suzuki–Miyaura cross-couplings
作者:Seyyed Javad Sabounchei、Ali Hashemi
DOI:10.1016/j.inoche.2014.07.027
日期:2014.9
Abstract Five α-keto stabilized sulfonium ylides as type (Me) 2 SCHC(O)C 6 H 4 - p -X (X = H, Br, NO 2 , CH 3 and OCH 3 ) L 1 – L 5 } were used as ligand precursors in the Suzuki–Miyaura cross-coupling reaction. The best catalytic performance was obtained by using a sulfonium ylide/Pd ratio of 2:1. The catalytic systems displayed high activities, which increased in the order R = NO 2 ( L 3 ) L 2
摘要 五种α-酮稳定的锍叶立德为 (Me) 2 SCHC(O)C 6 H 4 - p -X (X = H, Br, NO 2 , CH 3 和 OCH 3 ) L 1 – L 5 } 是在 Suzuki-Miyaura 交叉偶联反应中用作配体前体。通过使用 2:1 的锍叶立德/Pd 比获得最佳催化性能。催化系统显示出高活性,其增加顺序为 R = NO 2 (L 3 ) L 2 ) L 1 ) 3 ( L 4 ) 3 ( L 5 )。0.05 mol% PdCl 2 和 0.1 mol% L 5 的 DMF 在 130 °C 下,各种电子活化、失活和中性芳基卤化物和芳基硼酸之间的偶联反应在很短的反应时间内顺利进行,无需排除空气这使相应产品的收率良好。所有研究的配体在 Suzuki-Miyaura 交叉偶联中表现出非常高的活性,