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
Bifunctional phase-transfer catalysts for synthesis of 2-oxazolidinones from isocyanates and epoxides
作者:Dong-Xiao Cui、Yue-Dan Li、Ping Huang、Zhuang Tian、Yan-Yan Jia、Ping-An Wang
DOI:10.1039/d0ra00693a
日期:——
A series of bifunctional phase-transfercatalysts (PTCs) were synthesized to catalyze the [3 + 2] coupling reaction of isocyanates and epoxides to afford 2-oxazolidinones in good to high yields (up to 92% yield) using PhCl as a solvent at 100 °C within 12 h. These bifunctional PTCs were easily prepared from commercially available tertiary-primary diamines and isocyanates (or isothiocyanates, mono-squaramides
The catalytic system ‘Rhodamine B/additive’ for the chemical fixation of CO2
作者:Feng-tian Wu、Ling Wu、Chun-na Cui
DOI:10.1016/j.tet.2021.131965
日期:2021.3
The catalytic system ‘RhodamineB/additive’ was introduced to promote the CO2 reactions. We synthesized various cyclic carbonates in good to excellent yields under the catalysis of rhodamineB and TBAB. A variety of 2-oxazolidinone derivatives were obtained in the presence of rhodamineB and DBU.
Potassium phosphate-catalyzed one-pot synthesis of 3-aryl-2-oxazolidinones from epoxides, amines, and atmospheric carbon dioxide
作者:Ue Ryung Seo、Young Keun Chung
DOI:10.1039/c6gc02934e
日期:——
Potassium phosphate was found to be a highly active catalyst in the three-component cycloaddition of amine, epoxide, and carbondioxide in DMF at ambient temperature to form 3-aryl-2-oxazolidinones. Atmospheric CO2...