Poly(hydroxamic acid) functionalized copper catalyzed C–N bond formation reactions
作者:Md. Shaharul Islam、Bablu Hira Mandal、Tapan Kumar Biswas、Md. Lutfor Rahman、S. S. Rashid、Suat-Hian Tan、Shaheen M. Sarkar
DOI:10.1039/c6ra08155j
日期:——
Highly active poly(hydroxamic acid) functionalized copper catalysts were synthesized by the surface modification of khaya cellulose through graft copolymerization and subsequent hydroximation processes. The prepared catalysts were well characterized by FTIR, FESEM, HRTEM, ICP-AES, UV-vis and XPS analyses. The supported catalysts effectively promoted C–N bond formation reactions and provided excellent
TiCl<sub>2</sub>(OTf)-SiO<sub>2</sub>: A solid stable lewis acid catalyst for Michael addition of α-Aminophosphonates, Amines, Indoles and Pyrrole
作者:Habib Firouzabadi、Naser Iranpoor、Soghra Farahi
DOI:10.1080/10426507.2017.1417298
日期:2018.5.4
TiCl3(OTf) on silica gel surface and introduced as a non-hygroscopic Lewis acidcatalyst for C-N and C-C bond formation via Michaeladditionreaction. A variety of structurally diverse nitrogen nucleophiles including α-aminophosphonates, aliphatic and aromatic amines and imidazole were evaluated as Michael donors. Friedel–Crafts alkylation of indoles and pyrrole was also investigated through Michael addition
摘要 TiCl2(OTf)-SiO2 是通过将 TiCl3(OTf) 固定在硅胶表面上简单制备的,并作为非吸湿性路易斯酸催化剂引入,通过迈克尔加成反应形成 CN 和 CC 键。各种结构不同的氮亲核试剂,包括 α-氨基膦酸酯、脂肪族和芳香族胺以及咪唑被评估为迈克尔供体。在 TiCl2(OTf)-SiO2 作为催化剂存在下,通过迈克尔加成反应研究了吲哚和吡咯的 Friedel-Crafts 烷基化反应。反应在室温或 60 °C 下在无溶剂条件下进行,以高产率获得所需的迈克尔加合物。图形概要
Waste corn-cob cellulose supported bio-heterogeneous copper nanoparticles for aza-Michael reactions
作者:Shaheen M. Sarkar、T. Sultana、Tapan Kumar Biswas、Md. Lutfor Rahman、Mashitah Mohd Yusoff
DOI:10.1039/c5nj02437d
日期:——
Waste corn-cob cellulose supported Cu-nanoparticles were found to be a highly effective catalyst for aza-Michael reactions at room temperature.
A Basic Ionic Liquid as Catalyst and Reaction Medium: A Rapid and Simple Procedure for Aza-Michael Addition Reactions
作者:Jian-Ming Xu、Qi Wu、Qing-Yi Zhang、Fu Zhang、Xian-Fu Lin
DOI:10.1002/ejoc.200600999
日期:2007.4
and quantitative procedure for Michael additionreactions between various amines and α,β-unsaturated carbonyl compounds and nitriles in the presence of an easily accessible basicionicliquid – 3-butyl-1-methylimidazolium hydroxide, [bmIm]OH – as both catalyst and reactionmedium has been developed. For large-scale reactions the products could be directly distilled from the ionicliquid, allowing the