Transition-Metal-Free Cross-Coupling of Aryl and Heteroaryl Thiols with Arylzinc Reagents
作者:Bo Yang、Zhong-Xia Wang
DOI:10.1021/acs.orglett.7b03145
日期:2017.11.17
Cross-coupling of (hetero)arylthiols with arylzinc reagents via C–S cleavage was performed under transition-metal-free conditions. The reaction displays a wide scope of substrates and high functional-group tolerance. Electron-rich and -deficient (hetero)arylthiols and arylzinc reagents can be employed in this transformation. Mg2+ and Li+ ions were demonstrated to facilitate the reaction.
Iron(<scp>ii</scp>) triflate/N-heterocyclic carbene-catalysed cross-coupling of arylmagnesiums with aryl chlorides and tosylates
作者:Yi-Yuan Chua、Hung A. Duong
DOI:10.1039/c5cc08302h
日期:——
In comparison to iron(II) halides, iron(II) triflate exhibits a greater resistance towards reduction by p-tolylmagnesium bromide. This knowledge led to the development of an iron(II) triflate/N-heterocyclic carbene-catalysed cross-coupling of aryl...
Non‐activated aryl fluorides reacted with potassium diorganophosphinites through a nucleophilic aromatic substitution (SNAr) reaction. Remarkably, both electron‐neutral and electron‐rich aryl fluorides participated in the reaction with substantially stabilized anionic P nucleophiles to form the corresponding tertiary phosphine oxides. Quantum chemical calculations suggested a nucleophile‐dependent
非活化的芳基氟化物通过亲核芳香取代(S与钾diorganophosphinites反应Ñ AR)反应。值得注意的是,电子中性和电子富集的芳基氟化物均与基本上稳定的阴离子P亲核试剂参与反应,形成相应的叔膦氧化物。量子化学计算表明,亲核试剂依赖的机制涉及协同的和逐步的S N Ar反应途径。
Manganese-Catalyzed Aerobic Heterocoupling of Aryl Grignard Reagents
the MnCl2-catalyzed cross-coupling reaction of two arylmagnesium bromides under dioxygen. The reaction was achieved by using the Grignardreagents in a 2:1 ratio and 20 % of MnCl2. Very good yields of the heterocoupling product were obtained when the limiting Grignardreagent underwent little homocoupling under the reaction conditions. Arylmagnesium bromides that contain p-methoxy, p-(dimethylamino),
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。