The Reaction of Carbonyldiimidazole with Alcohols to Form Carbamates and<i>N-</i>Alkylimidazoles
作者:Jonathan L. Vennerstrom、Yuanqing Tang、Yuxiang Dong
DOI:10.1055/s-2004-831215
日期:——
The reactions of non-benzylic primary and secondary aliphatic alcohols with carbonyldiimidazole (CDI) afford the corresponding carbamates but not N-alkylimidazoles. For benzylic primary alcohols, formation of N-alkylimidazoles proceeds reasonably at 170 °C in several different solvents and occurs by way of the initially formed carbamate. However, under these rather forcing conditions, or even at lower
Synthesis of a novel poly(ethylene glycol) grafted triethylamine functionalized dicationic ionic liquid and its application in one-pot synthesis of 2-amino-2-chromene derivatives in water
作者:Yinglei Wang、Chun Yue、Xia Li、Jun Luo
DOI:10.1016/j.crci.2016.03.002
日期:2016.8
Abstract A novel poly(ethylene glycol) grafted triethylamine functionalizeddicationicionicliquid has been prepared and characterized. It was successfully used as an efficient catalyst for the three-component synthesis of 2-amino-2-chromene derivatives in water. The simple workup, mild reaction conditions, wide substrate flexibility, excellent yields, and environmental friendliness are notable advantages
A PEG bridged tertiary amine functionalized ionic liquid exhibiting thermoregulated reversible biphasic behavior with cyclohexane/isopropanol: synthesis and application in Knoevenagel condensation
作者:Jun Luo、Tantan Xin、Yinglei Wang
DOI:10.1039/c2nj40890b
日期:——
A novel poly(ethylene glycol) bridged tertiary amine functionalized ionic liquid PEG800-DPIL(Cl) was synthesized. It can form a temperature driven reversible biphasic system with cyclohexane/isopropanol mixed solvent. This biphasic system was applied in Knoevenagel condensation up to 99%. PEG800-DPIL(Cl) could be simply recovered and recycled for several runs.