Suzuki–Miyaura biaryl and diarylmethane syntheses via the coupling of arylboronic acids with aryl and arylmethyl bromides are performed in water by means of two new CNC-type palladium pincer complexes. Good to excellent results (including high TON values and extended recycling procedures) are obtained in most cases for a range of electronically dissimilar halides and boronic acids. On the basis of
Efficient N-heterocyclic carbene nickel pincer complexes catalyzed cross coupling of benzylic ammonium salts with boronic acids
作者:Xi-Yu Liu、Hai-Bo Zhu、Ya-Jing Shen、Jian Jiang、Tao Tu
DOI:10.1016/j.cclet.2016.09.006
日期:2017.2
Abstract Pyridine-bridgedbis-benzimidazolylidene nickel complexes exhibited very high catalytic activity toward cross coupling of inactive (hetero)aryl benzylic ammonium salts with (hetero)aryl and alkenyl boronic acids under mild reaction conditions. Even at 2 mol% catalyst loading, a wide range of substrates for both coupling partners with different steric and electronic properties were well tolerated
Palladium-catalyzed cross-coupling of benzyltitanium(IV) reagents with aryl fluorides
作者:Yan Li
DOI:10.1007/s00706-021-02881-w
日期:2022.2
The first palladium-catalyzed cross-coupling between benzyltitanium(IV) reagents with aryl fluorides is reported. A variety of diarylmethanes can be prepared in good to excellent yields by the catalyst system of PdCl2(dppf)2 associated with 1-[2-(di-tert-butylphosphanyl)phenyl]-4-methoxypiperidine. This reaction offered a highly efficient approach to diarylmethanes that are commonly found in life-changing
cross-coupling of thiol derivatives with aryl bromides has now been established. This procedure provides access to simple and complex unsymmetrical diarylmethane molecules under mild reaction conditions with a broad functional group tolerance. The key steps of the reaction involve a silane-mediated halogen-atom transfer (XAT) and a subsequent intramolecular homolytic substitution (SH), forming C-centered
金属光氧化还原过程已成为 C−C 键形成的有效方法。现在已经建立了硫醇衍生物与芳基溴的 Ni-光氧化还原催化脱硫交叉偶联。该过程提供了在具有广泛的官能团耐受性的温和反应条件下获得简单和复杂的不对称二芳基甲烷分子的途径。反应的关键步骤涉及硅烷介导的卤素原子转移 (XAT) 和随后的分子内均裂取代 ( SH ),如机理研究所示,从各种硫醇衍生物形成以C为中心的自由基。这项研究为大量天然存在的硫醇的新转化铺平了道路。
A Nonsymmetric Pincer-Catalyzed Suzuki−Miyaura Arylation of Benzyl Halides and Other Nonactivated Unusual Coupling Partners
The catalytic activity of a PCN-type palladium pincer complex is evaluated in the construction of C(sp(2))-C C(sp(2)) and C(sp(2))-C(sp(3)) bonds by Suzuki-Miyaura cross-couplings employing nontypical subs such as benzyl halides, alpha-haloenones, or alkylboronic acids as coupling partners. Most of the reported reactions are achieved in aqueous media, with all of the advantages implied.