A Concerted Transfer Hydrogenolysis: 1,3,2-Diazaphospholene-Catalyzed Hydrogenation of NN Bond with Ammonia-Borane
作者:Che Chang Chong、Hajime Hirao、Rei Kinjo
DOI:10.1002/anie.201400099
日期:2014.3.24
1,3,2‐diazaphospholenescatalyzemetal‐free transfer hydrogenation of a NN double bond using ammonia–borane under mild reaction conditions, thus allowing access to various hydrazine derivatives. Kinetic and computational studies revealed that the rate‐determining step involves simultaneous breakage of the BH and NH bonds of ammonia–borane. The reaction is therefore viewed as a concerted type of
Hydrogen peroxide based oxidation of hydrazines using HBr catalyst
作者:Jian Wang、Zichao Ma、Wanting Du、Liming Shao
DOI:10.1016/j.tet.2021.132546
日期:2021.12
Azo compounds (RN = NR′) are an important class of organic molecules that find wide application in organic synthesis. Herein, we report an efficient, practical and metal-free oxidation of hydrazines (RNH-NHR’) to azo compounds using 5 mol% HBr and hydrogen peroxide as terminal oxidant. This new method has been demonstrated by 40 examples with excellent yields. In addition, we showcased two examples
Bi(I)-Catalyzed Transfer-Hydrogenation with Ammonia-Borane
作者:Feng Wang、Oriol Planas、Josep Cornella
DOI:10.1021/jacs.9b00594
日期:2019.3.13
transfer-hydrogenation utilizing a well-defined Bi(I) complex as catalyst and ammonia-borane as transfer agent has been developed. This transformation represents a unique example of low-valent pnictogen catalysis cycling between oxidation states I and III, and proved useful for the hydrogenation of azoarenes and the partial reduction of nitroarenes. Interestingly, the bismuthinidene catalyst performs
已经开发了利用明确定义的 Bi(I) 配合物作为催化剂和氨硼烷作为转移剂的催化转移氢化。这种转变代表了氧化态 I 和 III 之间的低价色素原催化循环的独特例子,并被证明可用于偶氮芳烃的氢化和硝基芳烃的部分还原。有趣的是,铋烯催化剂在低价过渡金属敏感官能团的存在下表现良好,并且与类似的磷基催化相比表现出正交反应性。机理研究表明,一种难以捉摸的铋物种的中间体,被认为是氢化和氢形成的原因。
Chemoselective electrochemical reduction of nitroarenes with gaseous ammonia
作者:Liu Chang、Jin Li、Na Wu、Xu Cheng
DOI:10.1039/d1ob00077b
日期:——
Valuable aromatic nitrogen compounds can be synthesized by reduction of nitroarenes. Herein, we report electrochemicalreduction of nitroarenes by a protocol that uses inert graphite felt as electrodes and ammonia as a reductant. Depending on the cell voltage and the solvent, the protocol can be used to obtain aromatic azoxy, azo, and hydrazo compounds, as well as aniline derivatives with high chemoselectivities