Polytopic Oxazoline-Based Chiral Ligands for Cyclopropanation Reactions: A New Strategy to Prepare Highly Recyclable Catalysts
作者:José I. García、Clara I. Herrerías、Beatriz López-Sánchez、José A. Mayoral、Oliver Reiser
DOI:10.1002/adsc.201100213
日期:2011.10
New polytopic chiral copper complexes based on azabis(oxazoline) moieties have been synthesized and applied in cyclopropanation reactions of several alkenes. Excellent enantioselectivities have been obtained in all cases and additionally, the catalysts have been recovered in up to 14 cycles without noticeable loss of activity and selectivity. Analysis of the copper complexes by mass spectrometry suggests
合成了基于氮杂双(恶唑啉)部分的新型多手性铜配合物,并将其应用于几种烯烃的环丙烷化反应中。在所有情况下均获得了优异的对映选择性,此外,该催化剂已在多达14个循环中进行了回收,而活性和选择性却没有明显下降。通过质谱分析铜络合物表明形成了配位聚合物,代表了催化剂的静止状态。