Practical Ni-Catalyzed Cross-Coupling of Unsaturated Zinc Pivalates with Unsaturated Nonaflates and Triflates
摘要:
A practical nickel-catalyzed cross-coupling of (hetero)aryl or alkynylzinc pivalates with various unsaturated nonaflates or triflates is described. Organozinc pivalates allow these cross-couplings to take place with high yields and a low catalyst loading (0.5 mol %). Couplings with (E)- and (Z)-alkenyl triflates proceed with retention of configuration.
heteroaryl, alkyl, or benzylic polyfunctional zinc reagents obtained by the addition of zinc and LiCl to the corresponding organic iodides undergo smooth Pd(0)-catalyzed cross-coupling reactions with aryl bromides, chlorides, and triflates in the presence of PEPPSI as a catalyst. This procedure avoids the manipulation of water and air-sensitive organozincreagents and produces cross-coupling products in high
We report the synthesis of 2-(anthracen-9-yl)-1H-inden-3-yl dicyclohexylphosphine and its use in palladium-catalyzed borylation/Suzuki-Miyauracross-coupling reaction to prepare a variety of symmetrical and unsymmetrical biaryl compounds in excellent yield.
A pH-responsive Pd(II) N-heterocyclic tetracarbene complex synthesized by a solvothermal method was reported. It can be a highly activereusablecatalyst to homogeneously catalyze the Suzuki–Miyaura cross-coupling reaction in water and can be heterogeneously recovered by simply adjusting the pH value of the aqueous reaction media.
A new, <i>substituted</i> palladacycle for ppm level Pd-catalyzed Suzuki–Miyaura cross couplings in water
作者:Balaram S. Takale、Ruchita R. Thakore、Sachin Handa、Fabrice Gallou、John Reilly、Bruce H. Lipshutz
DOI:10.1039/c9sc02528f
日期:——
an aqueous micellar medium, enabling valued Suzuki–Miyaura couplings to be run not only in water under mild conditions, but at 300 ppm of Pd catalyst. This general methodology has been applied to several targets in the pharmaceutical area. Multiple recyclings of the aqueous reaction mixture involving both the same as well as different coupling partners is demonstrated. Low temperature microscopy (cryo-TEM)
[2,2′-Bipyridin]-6(1<i>H</i>)-one, a Truly Cooperating Ligand in the Palladium-Mediated C–H Activation Step: Experimental Evidence in the Direct C-3 Arylation of Pyridine
作者:Vanesa Salamanca、Alberto Toledo、Ana C. Albéniz
DOI:10.1021/jacs.8b10680
日期:2018.12.26
ligand [2,2'-bipyridin]-6(1 H)-one (bipy-6-OH) has a strong accelerating effect on the Pd-catalyzed direct arylation of pyridine or arenes. The isolation of relevant intermediates and the study of their decomposition unequivocally show that the deprotonated coordinated ligand acts as a base and assists the cleavage of the C-H bond. Mechanistic work indicates that the direct arylation of pyridine with