An efficient palladium catalyzed Mizoroki–Heck cross-coupling in water
作者:Sanjay N. Jadhav、Chandrashekhar V. Rode
DOI:10.1039/c7gc02869e
日期:——
Pd-catalysed Mizoroki–Heck coupling reaction was successfully performed in water in the absence of any additives under aerobic conditions. The various key reaction parameters that affect the yield of the desired cross-coupling product were optimized. The Pd(PPh3)4/Et3N/H2O/98 °C catalyst system was found to be highly active (TOF = 12 to 14 h−1) towards achieving excellent yield of the Mizoroki–Heck coupling
在有氧条件下,在没有任何添加剂的情况下,水中成功地进行了均相Pd催化的Mizoroki-Heck偶联反应。优化了影响所需交叉偶联产物收率的各种关键反应参数。发现Pd(PPh 3)4 / Et 3 N / H 2 O / 98°C催化剂体系具有很高的活性(TOF = 12至14 h -1),可实现出色的Mizoroki–Heck偶联产物的收率。在最短的反应时间内,吸电子以及给电子的芳基溴化物和氯化物种类繁多。钯(PPh 3)4对Mizoroki-Heck偶联反应过程中的催化剂失活进行了研究,并发展了实现十倍Pd-金属可循环性而又没有明显损失其活性的策略。因此,提出的机制提供了在水性介质中接触各种烯烃的途径,从而使该协议变得环保。
Heck-type coupling vs. conjugate addition in phosphine–rhodium catalyzed reactions of aryl boronic acids with α,β-unsaturated carbonyl compounds: a systematic investigation
Heck-type coupling and conjugateaddition by synergistically tuning the supporting ligand, the boronic acid to olefin ratio and other reaction conditions. Conjugateaddition with selectivity >99% and Heck-type coupling with selectivity of up to 100%, 98% and 84% for acrylates, acrylamides and methyl vinyl ketone, respectively, could be achieved in the rhodium-catalyzed reactions of aryl boronic acids
2-Aminophenyl diphenylphosphinite as a new ligand for heterogeneous palladium-catalyzed Heck–Mizoroki reactions in water in the absence of any organic co-solvent
introduced as a new ligand for the Heck–Mizoroki reactions of aryl halides with styrene and n-butylacrylate in water in the presence of palladium acetate. This ligand is easily prepared from the reaction of chlorodiphenyl phosphine with 2-aminophenol in high yield. Pre-catalyst [Pd(OAc)2] in the presence of the ligand produces a black solid mass. The solid catalyst has been recycled for the reaction of bromobenzene
Magnetically-recoverable Schiff Base Complex of Pd (II) Immobilized on Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>Nanoparticles: An Efficient Catalyst for Mizoroki-Heck and Suzuki-Miyaura Coupling Reactions
作者:Mohsen Esmaeilpour、Jaber Javidi
DOI:10.1002/jccs.201500013
日期:2015.7
The activity of Pd(II)‐Schiffbasecomplex molecules grafted on the surface of Fe3O4@SiO2 particles were investigated in the palladium‐catalyzed couplingreactions of aryl halides with alkenes (Mizoroki‐Heck reaction) and phenylboronic acids (Suzuki‐Miyaura reaction) in the absence of phosphorous ligands. This method shows notable advantages such as heterogeneous nature of the catalyst, excellent yields
在钯催化的芳基卤化物与烯烃(Mizoroki-Heck反应)和苯基硼酸(Suzuki)的偶联反应中,研究了接枝到Fe 3 O 4 @SiO 2颗粒表面上的Pd(II)-Schiff碱配合物分子的活性。‐Miyaura反应)在没有磷配体的情况下。该方法显示出显着的优点,例如催化剂的非均相性质,优异的产率,较短的反应时间,易于制备,操作简单和反应曲线更清洁。可以通过在外部施加永磁体将催化剂从反应混合物中分离出来,并且可以重复使用几次而不会显着降低活性。另外,已经通过ICP分析确定了钯的浸出量。
Heck reaction with heteroaryl halides in the presence of a palladium-tetraphosphine catalyst
cis,cis,cis-1,2,3,4-Tetrakis(diphenylphosphinomethyl)cyclopentane/[PdCl(C3H5)]2 system catalyses efficiently the Heck reaction of heteroaryl halides with n-butyl acrylate, styrene, vinylpyridine and vinyl ether derivatives. High turnover numbers can be obtained for the reactions with halo pyridines, quinolines, furans or thiophenes.