the reaction of carbon dioxide with terminal epoxides or aziridines at ambient temperature and 1 bar carbon dioxide pressure. Only 1.0 mol% of both (salen)CoI 3g and phosphorane 4d are required for cyclic carbonate synthesis, and the catalyst loading could even be lowered down to 0.1 mol%. Under this condition, no polycarbonate formation is detected by NMR analysis. It is proposed that the high efficiency
Synthesis of chiral oxazolidinone derivatives through lipase-catalyzed kinetic resolution
作者:Yan Zhang、Yang Zhang、Yansong Ren、Olof Ramström
DOI:10.1016/j.molcatb.2015.08.004
日期:2015.12
The synthesis of enantioenriched oxazolidinone derivatives through lipase-catalyzed kineticresolution is described. The synthesis comprised a two-step, cascade acylation in one pot, resulting in a range of oxazolidinone derivatives in good yields and excellent enantiopurities.
The catalytic potential of a large series of easily available metal carbamates (based on thirteen different non-precious metal elements) was explored for the first time in the coupling reaction between 2-aryl-aziridines and carbondioxide, working under solventless and ambient conditions and using tetraalkylammonium halides as co-catalysts. The straightforward synthesis of novel [NbCl3(O2CNEt2)2],
dioxide, highlighting the superior activity of [NH2Et2]I. Then, working at room temperature, atmospheric CO2 pressure and in the absence of solvent, the [NH2Et2]I-catalyzed synthesis of a series of 5-aryl-2-oxazolidinones was accomplished in good to high yields and excellent selectivity, from 2-aryl-aziridines with N-methyl or N-ethyl groups. NMR studies and DFT calculations outlined the pivotal role of
在模型氮丙啶与二氧化碳的偶联反应中探索了卤化铵盐的催化潜力,突出了 [NH 2 Et 2 ]I 的优越活性。然后,在室温、大气 CO 2压力和无溶剂条件下,[NH 2 Et 2 ]I 催化合成一系列 5-aryl-2-oxazolidinones 以良好至高产率和优异的选择性完成, 来自具有N-甲基或N的 2-芳基-氮丙啶-乙基。NMR 研究和 DFT 计算概述了二乙基铵阳离子和碘化物阴离子的关键作用。所提出的方法代表了一种方便的选择,用于获得有限数量的有价值的分子,即使在最近几年也已经报道了更复杂和更昂贵的催化系统。