Efficient Catalysts of Acyclic Guanidinium Iodide for the Synthesis of Cyclic Carbonates from Carbon Dioxide and Epoxides under Mild Conditions
作者:Naoto Aoyagi、Yoshio Furusho、Takeshi Endo
DOI:10.1055/s-0037-1610735
日期:2020.1
We have studied the synthesis of five-membered cyclic carbonates through the cycloaddition of CO2 to epoxides by using acyclic guanidinium salts. We have found that the cycloaddition reactions proceed smoothly at ordinary temperatures and pressures and result in good yields when acyclic guanidinium iodides are employed as catalysts. Both cation moiety and anion moiety of the guanidinium salts play
我们研究了通过CO 2的环加成反应合成五元环状碳酸酯通过使用无环胍盐形成环氧化物。我们发现,当使用无环胍碘化物作为催化剂时,环加成反应在常温常压下可顺利进行,并产生良好的收率。胍盐的阳离子部分和阴离子部分均在其催化活性中起重要作用。为了获得良好的催化活性,在阳离子部分上具有活性氢以及在阴离子部分上具有碘离子是必不可少的。具有三个或三个以上活泼氢的碘化胍在极性溶剂(例如1-甲基吡咯烷-2-酮)中以高收率得到环状碳酸酯,而具有一个或两个活泼氢的碘化胍在极性较小的溶剂(例如2-甲基四氢呋喃)中显示出良好的催化活性。 。