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。
Mono/Dual Amination of Phenols with Amines in Water
We herein describe a practical direct amination of phenols through a palladium-catalyzed hydrogen-transfer-mediated activation method to synthesize the secondary and tertiary amines. In this conversion, environmentally friendly water and inexpensive ammonium formate were used as solvent and reductant, respectively. A range of amines, including aliphatic amines, aniline, secondary amines, and diamines
Iodine Anion Catalyzed Cross-Dehydrogenative Aromatization for Access to Aromatic Amines
作者:Yan Shi、Cui Yi、Xiaoli Huang、Yuhai Tang、Jiao Jiao、Yang Li
DOI:10.1021/acs.joc.3c00860
日期:2023.7.7
efficient iodine anion catalyzed cross-dehydrogenative aromatization of cyclohexenones with amines has been developed under metal-free conditions, which affords aromatic amines in good to excellent yields with a broad substrate scope. Meanwhile, this reaction provides a new method for the construction of C(sp2)–N bonds and also a new strategy for slow generation of oxidants or electrophiles via in situ