The first nickel-catalyzed, magnesium-mediated reductive cross-coupling between benzyl chlorides and arylchlorides or fluorides is reported. A variety of diarylmethanes can be prepared in good to excellent yields in a one-pot manner using easy-to-access mixed PPh3/NHC Ni(II) complexes of Ni(PPh3)(NHC)Br2 (NHC = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene, IPr, 1a; 1,3-di-tert-butylimidazol-2-ylidene
Ni(NIXANTPHOS)-Catalyzed Mono-Arylation of Toluenes with Aryl Chlorides and Bromides
作者:Hui Jiang、Sheng-Chun Sha、Soo A Jeong、Brian C. Manor、Patrick J. Walsh
DOI:10.1021/acs.orglett.9b00294
日期:2019.3.15
A nickel-catalyzedcross-coupling of toluene derivatives with both arylbromides and chlorides using a NIXANTPHOS-ligated nickel(II) complex has been developed. The key factor to success is proposed to be the catalyst activation of toluene by a cation−π complex, enabling methyl arenes (pKa ≈ 43) to be deprotonated with the relatively mild base NaN(SiMe3)2. This method facilitates access to a variety
Nickel-Catalyzed Cross-Coupling of Aryl 2-Pyridyl Ethers with Organozinc Reagents: Removal of the Directing Group via Cleavage of the Carbon–Oxygen Bonds
作者:Wei-Can Dai、Bo Yang、Shi-He Xu、Zhong-Xia Wang
DOI:10.1021/acs.joc.0c02389
日期:2021.2.5
arylzinc reagents under catalysis of NiCl2(PCy3)2 affords aryl–aryl cross-coupling products via selective cleavage of CAr–OPy bonds. The reaction features a wide substrate range and good compatibility of functional groups. β-H-free alkylzinc reagents are also applicable as the nucleophiles in the transformation, whereas β-H-containing alkylzinc reagents lead to a mixture of cross-coupling and hydrogenation
在NiCl 2(PCy 3)2的催化下,芳基2-吡啶基醚与芳基锌试剂的反应通过C Ar -OPy键的选择性裂解提供芳基-芳基交叉偶联产物。该反应具有广泛的底物范围和官能团的良好相容性。无β-H的烷基锌试剂也可用作转化中的亲核试剂,而含β-H的烷基锌试剂可导致交叉偶联和氢化产物的混合物。
Palladium and Nickel Catalyzed Suzuki Cross-Coupling with Alkyl Fluorides