Copper-Catalyzed Enantioselective [2+2] Cycloadditions of 2-Nitrosopyridine with Ketenes
作者:Indranil Chatterjee、Chandan Kumar Jana、Marc Steinmetz、Stefan Grimme、Armido Studer
DOI:10.1002/adsc.201000153
日期:——
Copper(I)‐catalyzed [2+2] cycloadditions of various ketenes with 2‐nitrosopyridine to afford synthetically highly valuable 1,2‐oxazetidine‐3‐ones are shown to occur with good enantioselectivities. The thermal uncatalyzed process furnishes the unstable regioisomeric oxazetidinone. Density function theory (DFT) calculations give evidence that the reaction occurs via a concerted [2+2] cycloaddtion pathway
铜(I)催化的各种烯酮与[2- +亚硝基吡啶]的[2 + 2]环加成反应可提供合成上非常有价值的1,2-氧杂氮杂环丁烷-3-酮,并具有良好的对映选择性。热的未催化过程提供了不稳定的区域异构的恶唑烷酮。密度泛函理论(DFT)计算提供了证据,表明该反应是通过一致的[2 + 2]环加成途径发生的。