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.
在超临界条件下,二氧化碳与炔丙醇和胺的环加成反应生成4-甲亚胺基噁唑烷-2-酮或4-甲基噁唑-2-酮。优化的条件包括使用醇(2 mmol)、胺(2 mmol)、碘化亚铜(0.1 mmol)、二氧化碳(8 MPa)和60 °C的温度。区域化学控制取决于炔丙醇的取代基。三级炔丙醇产生4-甲亚胺基噁唑烷-2-酮,而一级和二级炔丙醇生成4-甲基噁唑-2-酮。还研究了温度、压力和时间等各种参数的影响。