Reduction of hydrazines to amines with low-valent titanium reagent
作者:Fang Ren、Yan Zhang、Lan Hu、Meiming Luo
DOI:10.3998/ark.5550190.0014.313
日期:——
The N,N bond cleavage in hydrazines to amines via low-valenttitaniumreagent prepared in situ by treatment of TiCl4 with Mg powder in THF or CH2Cl2-Et2O is described. The reaction proceeds smoothly under mild conditions to afford amines in good to excellent yields with diverse functional group tolerance such as chloride, methoxyl, benzyloxyl, ester, acyl, as well as C,C double bonds and benzyl-nitrogen
Synthesis of trisubstituted hydrazine <i>via</i> MnO<sub>2</sub>-promoted oxidative coupling of <i>N</i>,<i>N</i>-disubstituted hydrazine and boronic ester
作者:Jiaoyang Wang、Danfeng Wang、Xiaofeng Tong
DOI:10.1039/d1ob00929j
日期:——
oxidative coupling process between N,N-disubstituted hydrazine and boronic ester is reported. A 1,1-diazene species is firstly generated upon oxidation of a hydrazine substrate in the presence of MnO2 which then interacts with boronic ester to form the key intermediate boron-ate complex, followed by migration from boron to nitrogen to form a new C–N bond. This new finding provides mild, scalable, and
报道了MnO 2促进的N,N-二取代肼和硼酸酯之间的氧化偶联过程。首先在 MnO 2存在下氧化肼底物产生 1,1-二氮烯物种,然后与硼酸酯相互作用形成关键的中间体硼酸酯复合物,然后从硼迁移到氮形成新的 C -N 键。这一新发现提供了对三取代肼的温和、可扩展且操作简单的途径。
A catalytic dehydrogenation route to azomethine imines.
Catalytic dehydrogenation of appropriate N,N,N/- trisubstituted hydrazines with 10 mol% palladiumblack, ruthenium black, or Wilkinson's catalyst, in hot DMF in the presence of Nmethylmaleimide occurs with high regioselectivity and leads to cycloadducts of the intermediate azomethine imines in moderate to good yield.