An efficient synthesis of quinazoline-2,4-dione derivatives with the aid of a low-valent titanium reagent
作者:Da-Qing Shi、Guo-Lan Dou、Zheng-Yi Li、Sai-Nan Ni、Xiao-Yue Li、Xiang-Shan Wang、Hui Wu、Shun-Jun Ji
DOI:10.1016/j.tet.2007.07.011
日期:2007.9
A facile synthetic method using low-valenttitaniumreagent (TiCl4/Zn system) to promote the novel reductive cyclization of 2-nitrobenzamides and triphosgene is described. Sequentially, a series of quinazoline-2,4-diones were synthesized in good yields.
Facile synthesis of 4-substituted 1,2,4,5-tetrahydro-1,4-benzodiazepin-3-ones by reductive cyclization of 2-chloro-N-(2-nitrobenzyl)acetamides
作者:Leandro D. Sasiambarrena、Ivan A. Barri、Guido G. Fraga、Rodolfo D. Bravo、Agustín Ponzinibbio
DOI:10.1016/j.tetlet.2018.12.029
日期:2019.1
A facile and efficient method was developed for the synthesis of 1,2,4,5-tetrahydro-1,4-benzodiazepine-3-ones from 2-chloro-N-(2-nitrobenzyl)acetamides through a reductive cyclization using iron-ammonium chloride in ethanol–water in good yields. This method provides a simple approach to these benzodiazepine-3-ones which are of high value in the field of medicinal chemistry research.
from a rhodium center to imine substrates in a biomimetic way. Under both transfer hydrogenation and reductiveamination reaction conditions, the catalyst exhibited good selectivity towards CN bonds. With the catalyst, 34 imines were transfer hydrogenated to corresponding amines and a key intermediate of retigabine was prepared via reductiveamination in a greener way. According to the NMR observations
将基于金属和键合辅因子模拟物之间合作的策略应用于 CN 键的转移氢化。我们设计并合成了一种含有 1,3-二甲基苯并咪唑部分的铑配合物,它可以以仿生的方式将氢化物从铑中心转移到亚胺底物上。在转移氢化和还原胺化反应条件下,催化剂对C N 键表现出良好的选择性。使用该催化剂,34个亚胺被转移氢化成相应的胺,并通过还原胺化以更绿色的方式制备了瑞替加滨的关键中间体。根据核磁共振观察和同位素实验,提出了这种仿生还原碳氮键的合理机制。
Preparation of Arylamines form Aldehydes by Zn(BH4)2/MgBr2
作者:Mina Mahmoudi、Davood Setamdideh
DOI:10.13005/ojc/310280
日期:2015.6.20
Reductive aminationa variety of aldehydes with different anilines has been performed by Zn(BH4)2/MgBr2 as reducing system in THF at room temperature in high to excellent yields of the corresponding secondary amines (80-90%).
Solvent-free mechanochemical and one-pot reductive benzylizations of malononitrile and 4-methylaniline using Hantzsch 1,4-dihydropyridine as the reductant
作者:Ze Zhang、Jie Gao、Jing-Jing Xia、Guan-Wu Wang
DOI:10.1039/b502662h
日期:——
Under mechanical milling conditions, direct reductive benzylizations of malononitrile and 4-methylaniline by aromatic aldehydes were achieved using a Hantzsch 1,4-dihydropyridine as the reductant.