Pallada- and platinacycle complexes of phosphorus ylides; synthesis, X-ray characterization, theoretical and electrochemical studies and application of Pd(II) complexes as catalyst in Suzuki-Miyaura coupling reaction
作者:Seyyed Javad Sabounchei、Asieh Sedghi、Ali Hashemi、Marjan Hosseinzadeh、Mehdi Bayat、Robert W. Gable
DOI:10.1002/aoc.3850
日期:2017.12
(6)). Cyclic voltammetry, elemental analysis, IR and NMR (1H, 13C and 31P) spectroscopic methods were used for characterization of the obtained compounds. Further, the structure of complexes 3 and 4 were characterized crystallographically. Palladacycles 3 and 4 were proved to be excellent catalysts for the Suzuki‐Miyaura coupling reactions of various aryl chlorides and arylboronic acids in mixed DMF/H2O
Nickel(0)-Catalyzed Cross-Coupling of Alkyl Arenesulfonates with Aryl Grignard Reagents
作者:Chul-Hee Cho、Hee-Sung Yun、Kwangyong Park
DOI:10.1021/jo026449n
日期:2003.4.1
nickel-catalyzed cross-coupling reactions of neopentyl arenesulfonates with arylmagnesium bromides, involving nucleophilic aromatic substitution of alkyloxysulfonyl groups by aryl nucleophiles, take place in high yields. Optimal efficiencies are obtained by adding 3 + 2 equiv of the Grignardreagent to a mixture of dppfNiCl(2) and the sulfonate in refluxing THF. Neopentyl arenesulfonates are useful sources of
Transition‐Metal‐Free Oxidative Cross‐Coupling of Tetraarylborates to Biaryls Using Organic Oxidants
作者:Carolin Gerleve、Armido Studer
DOI:10.1002/anie.202002595
日期:2020.9
tetraarylborates undergo selective (cross)‐coupling through oxidation with Bobbitt's salt to give symmetric and unsymmetric biaryls. The organic oxoammonium salt can be used either as a stoichiometric oxidant or as a catalyst in combination with in situ generated NO2 and molecular oxygen as the terminal oxidant. For selected cases, oxidative coupling is also possible with NO2/O2 without any additional
容易制备的四芳基硼酸盐通过用博比特盐氧化进行选择性(交叉)偶联,得到对称和不对称的联芳基化合物。有机氧铵盐可用作化学计量氧化剂或与原位产生的NO 2和作为末端氧化剂的分子氧组合用作催化剂。对于某些情况,也可以使用 NO 2 /O 2进行氧化偶联,无需任何额外的氮氧自由基助催化剂。四芳基硼酸盐的无过渡金属催化氧化配体交叉偶联是前所未有的,所引入的方法提供了获得各种联芳基和杂联芳基系统的途径。
A palladium–phosphine catalytic system as an active and recycable precatalyst for Suzuki coupling in water
The Suzuki–Miyaura reaction of various aryl halides with aryl boronic acids using [Ph2PCH2PPh2CH=C(O)(C10H7)]PdCl2} as a catalyst has been investigated. The X-ray crystal structure of the catalyst reveals a five-membered chelate ring formed by coordination of the ligand through the phosphine group and the ylidic carbon atom to the metal center. This palladacycle exhibited excellent activities and reusability in the aqueous phase for the Suzuki cross-coupling reactions of arylboronic acids with aryl halides. The proposed protocol featured mild reaction conditions and notable simplicity and efficiency using Cs2CO3 as a base in water. The catalytic system could be reused four times without significant loss of activity.
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 stabilizedsulfoniumylides 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 sulfoniumylide/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,