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.
Ethynyl Ketene-<i>S</i>,<i>S</i>-acetals: The Highly Reactive Electron-Rich Dienophiles and Applications in the Synthesis of 4-Functionalized Quinolines via a One-Pot Three-Component Reaction
作者:Yu-Long Zhao、Wei Zhang、Shuang Wang、Qun Liu
DOI:10.1021/jo070069q
日期:2007.6.1
An efficient synthetic method for 4-functionalized quinoline derivatives, 4-((1,3-dithian-2-ylidene)methyl)quinolines, has been developed. Mediated by trifluoromethanesulfonic acid, ethynyl ketene-S,S-acetals can react in a one-pot procedure with various arylamines and aldehydes under mild conditions to give the corresponding quinoline derivatives in good to high yields via a consecutive arylimine formation, regiospecific aza-Diels-Alder (Povarov) reaction, and reductive amination.
5. The benzylation of amines. Part IV. The rate of reaction of benzyl bromide with nitrobenzylaniline and some derivatives
作者:D. H. Peacock
DOI:10.1039/jr9350000016
日期:——
Rhodium catalysts with cofactor mimics for the biomimetic reduction of CN bonds
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。
van den Berg, Recueil des Travaux Chimiques des Pays-Bas, 1936, vol. 55, p. 1053,1055