organocatalyst for the atom‐economic conversion of a plethora of alkyl‐ and aryl‐substituted epoxides and isocyanates into oxazolidinones is described. A mechanism was proposed wherein the nucleophilic ring‐opening operation, and oxo‐ and carbamate‐anions stabilization occur cooperatively towards isocyanate fixation.
Selective Synthesis of 5‐Substituted
<i>N</i>
‐Aryloxazolidinones by Cycloaddition Reaction of Epoxides with Arylcarbamates Catalyzed by the Ionic Liquid BmimOAc
作者:Elnazeer H. M. Elageed、Bihua Chen、Binshen Wang、Yongya Zhang、Shi Wu、Xiuli Liu、Guohua Gao
DOI:10.1002/ejoc.201600474
日期:2016.7
5-substituted N-aryloxazolidinones in excellent yields. In addition, chiral 5-substituted oxazolidinones were synthesized by this procedure in good-to-excellent yields with enantiomeric excesses in excess of 99.9 % starting from chiral terminalepoxides. A possible reaction mechanism is discussed in accord with the results obtained by 1H NMR spectroscopy and DFT calculations, which indicate the cooperative activation
Transformation of Carbon Dioxide into Oxazolidinones and Cyclic Carbonates Catalyzed by Rare-Earth-Metal Phenolates
作者:Bin Xu、Peng Wang、Min Lv、Dan Yuan、Yingming Yao
DOI:10.1002/cctc.201600534
日期:2016.8.8
Rare‐earth‐metal complexes stabilized by amine‐bridged tri(phenolato) ligands were developed, and their activities in catalyzing transformations of CO2 were studied. A series of terminal epoxides and challenging disubstituted epoxides were converted into the respective cyclic carbonates in the presence of CO2 in yields of 58 to 96 %. In addition, these rare‐earth‐metal complexes also showed good activities
one-component organocatalyst for the atom-economic transformation of epoxides to oxazolidinones under microwave irradiation. Integrating a positively charged center into phenols over a modular one-step preparation gives rise to a bifunctional system with improved acidity and activity, competent in rapid assembly of epoxides and isocyanates under microwave irradiation in a short reaction time (20–60 min)
2-Oxazolidones from Glycidyl Ether Reactions with Acid Amides
作者:Yoshio Iwakura、Shin-ichi Izawa
DOI:10.1246/bcsj.39.2490
日期:1966.11
The reaction between acid amides and aryl glycidyl ethers was carried out using tertiary amine as the catalyst. 2-Oxazolidone derivatives were obtained by the reaction of trichloroacetanilide or trifluoroacetanilide with aryl glycidyl ether. Acyl migration occurred in the reaction of acetanilide with phenyl glycidyl ether.