An Efficient and Eco-friendly Process for the Conversion of Carbon Dioxide into Oxazolones and Oxazolidinones under Supercritical Conditions
作者:Huanfeng Jiang、Jinwu Zhao、Azhong Wang
DOI:10.1055/s-2008-1032166
日期:2008.3
The cycloaddition reactions of carbon dioxide with propargylic alcohols and amines under supercritical conditions produce 4-methyleneoxazolidin-2-ones or 4-methyloxazol-2-ones. The optimized conditions consist of the use of an alcohol (2 mmol), an amine (2 mmol), copper(I) iodide (0.1 mmol), carbon dioxide (8 MPa), and a temperature of 60 °C. The regiochemical control is dependent on the substituents of the propargylic alcohols. Tertiary propargylic alcohols give 4-methyleneoxazolidin-2-ones, while primary and secondary ones generate 4-methyloxazol-2-ones. The effects of various parameters such as temperature, pressure, and time have also been investigated.
Facile and Mild Process for Chemical Fixation of CO<sub>2</sub>to 4-Methylene-1,3-oxazolidin-2-ones Under Solvent-Free Conditions
作者:Jingxiu Xu、Jinwu Zhao、Zhenbin Jia、Jianhe Zhang
DOI:10.1080/00397911003707014
日期:2011.2.28
[image omitted] 4-Methylene-1,3-oxazolidin-2-ones were prepared via the cycloadditon reaction of propargylic alcohols with primary amines and CO2 under atmospheric pressure at 60 degrees C in the absence of any additional solvent. This methodology affords an ecofriendly, mild, and easy approach to chemical fixation of CO2.