Ni<sup>0</sup>-catalyzed Direct Amination of Anisoles Involving the Cleavage of Carbon–Oxygen Bonds
作者:Mamoru Tobisu、Toshiaki Shimasaki、Naoto Chatani
DOI:10.1246/cl.2009.710
日期:2009.7.5
Ni 0 -catalyzed cross-coupling of aryl methyl ethers with amines is described. The use of an N-heterocyclic carbene as a ligand and NaOt-Bu as a base promotes the amination of anisole derivatives via the cleavage of normally unreactive aryl carbon-oxygenbonds.
描述了 Ni 0 催化的芳基甲基醚与胺的交叉偶联。使用 N-杂环卡宾作为配体和 NaOt-Bu 作为碱促进苯甲醚衍生物通过通常不活泼的芳基碳-氧键的断裂进行胺化。
this reaction amenable for industry. A plethora of synthetically very useful halogenated anilines, which often cannot be prepared via other transition-metal-catalyzed aminations, are readily produced using this method. Particularly, the orthogonal reactivity between pinacol arylborates and aryl iodides is demonstrated. Preliminary deuterium-labeling studies reveal a redox-neutral ipso-protonation mechanism
据报道,钯( II )/降冰片烯协同催化可实现频哪醇芳基硼酸盐或杂芳基硼酸盐的氧化还原中性邻位-C -H胺化,用于合成结构多样的苯胺。该方法具有可扩展性、稳健性(耐空气和湿气)、不含膦配体,并且与多种功能兼容。这些实用的特征使得该反应适合工业界。使用这种方法可以很容易地生产大量合成上非常有用的卤代苯胺,这些卤代苯胺通常无法通过其他过渡金属催化的胺化来制备。特别是,证明了频哪醇芳基硼酸盐和芳基碘化物之间的正交反应性。初步的氘标记研究揭示了该过程的氧化还原中性原质子化机制,这必将为该领域的未来发展带来启发。总体而言,该方法的范围极其广泛(47 个示例)和可靠性,加上频哪醇芳基硼酸酯的广泛可用性,使该化学成为现有苯胺合成方法的宝贵补充。
Highly efficient Ni-catalyzed C-N coupling in alkane solvents
作者:Xiaolin Jiang、Haiyan Hu、Shizhen Zhao、Qin Shi、Mei Wang、Zengyan Zhu、Yuehui Li
DOI:10.1016/j.mcat.2023.113395
日期:2023.8
often chosen for transitionmetalcatalyzed C-N coupling reactions. In this work, it was found that the use of alkane solvents (e.g. cyclohexane, heptane) allows for highly efficient Ni-catalyzed C-N coupling of aryl pseudohalides with different types of amines in the presence of NHC ligands. Excellent functional group tolerance was achieved. Stronger hydrogen bonding effect between amine NH moiety
Come full circle: A method for the nucleophilic amination of methoxy arenes was established by using sodium hydride (NaH) in the presence of lithium iodide (LiI). This method offers an efficient route to benzannulated nitrogen heterocycles. Mechanistic studies showed that the reaction proceeds through an unusual concerted nucleophilicaromaticsubstitution.