A cyclizative atmospheric CO2 fixation by unsaturated amines such as allyl and propargylamines under mild reaction conditions, efficiently leading to cyclic carbamates bearing a iodomethyl group, have been developed utilizing tert-butyl hypoiodite (t-BuOI).
A Zn(<scp>ii</scp>)-functionalized COF as a recyclable catalyst for the sustainable synthesis of cyclic carbonates and cyclic carbamates from atmospheric CO<sub>2</sub>
作者:Somnath Sarkar、Swarbhanu Ghosh、Sk. Manirul Islam
DOI:10.1039/d1ob01938d
日期:——
various substituents under sustainable conditions. A variety of terminal epoxides and slightly more complicated disubstituted epoxides were transformed into the corresponding cyclic carbonates with satisfactory to excellent yields (i.e., 69 to 99% yield) upon exposure to CO2 (1 atm) undersolvent-freeconditions (sustainable approach). On the other hand, this ZnII-loaded covalent organic framework also displayed
报道了一种带有 β-酮烯胺单元的简单共价有机框架 (COF) 作为潜在的多相配体,用于 Zn II催化的固定和 CO 2转化为增值化学品。催化研究令人信服地证明,Zn II官能化共价有机骨架(Zn@TpTta)在可持续条件下对具有各种取代基的各种环氧化物的 CO 2固定表现出完美的催化活性。多种末端环氧化物和稍微复杂的二取代环氧化物在暴露于 CO 2时转化为相应的环状碳酸酯,产率令人满意至极好(即69 至 99% 产率)(1 atm) 在无溶剂条件下(可持续方法)。另一方面,这种载有 Zn II的共价有机框架在促进大气环化 CO 2捕获方面也表现出优异的性能,这导致使用N从不饱和胺系统中形成不同的环状氨基甲酸酯(即产率 61% 至 94%)。-碘代琥珀酰亚胺 (NIS) 作为碘化剂,PEG-400 在无碱条件下作为可生物降解的绿色聚合物溶剂(可持续方法)。新合成的基于 COF 的催化剂,即
Convenient Synthesis of Oxazolidinones and Oxazinones from Allyl and Homoallyl Amines under Mild Conditions
Abstract An efficient one‐pot general method for the high‐yield synthesis in solution of oxazolidinones and oxazinones from allyl‐ and homoallylamines, respectively, has been developed. The reaction is carried out at an atmospheric pressure between 0°C and room temperature using a solution of carbon dioxide in acetonitrile and hindered guanidine as the base.