Efficient Access to Trifluoromethyl Diarylpyrrolines and their N-Oxides through Enantioselective Conjugate Addition of Nitromethane to β,β-Disubstituted Enones
作者:Hiroyuki Kawai、Zhe Yuan、Takashi Kitayama、Etsuko Tokunaga、Norio Shibata
DOI:10.1002/anie.201301123
日期:2013.5.17
The cupreidinium salt 1 catalyzes the highly enantioselective conjugate addition of nitromethane to β‐aryl‐β‐trifluoromethyl aryl enones (2). The biologically important chiral pyrrolines 4 and N‐oxide 5, having a trifluoromethylated all‐carbon quaternary chiral center, were easily synthesized from the key intermediate (R)‐3 in high to excellent yields. M.S.=molecular sieves.
铜鎓盐1催化硝基甲烷向β-芳基-β-三氟甲基芳基烯酮(2)的高对映选择性共轭加成反应。具有重要的手性吡咯啉4和N-氧化物5具有三氟甲基化的全碳四元手性中心,可以很容易地从关键中间体(R)-3上以高收率合成。MS =分子筛。