Simultaneous Induction of Axial and Planar Chirality in Arene-Chromium Complexes by Molybdenum-Catalyzed Enantioselective Ring-Closing Metathesis
作者:Ken Kamikawa、Sachie Arae、Wei-Yi Wu、Chihiro Nakamura、Tamotsu Takahashi、Masamichi Ogasawara
DOI:10.1002/chem.201500226
日期:2015.3.23
metathesis of the various Cs‐symmetric (π‐arene)chromium substrates provides the corresponding bridged planar‐chiral (π‐arene)chromium complexes in excellent yields with up to >99 % ee. With a bulky and unsymmetrical substituent, such as N‐indolyl or 1‐naphthyl, at the 2‐positions of the η6‐1,3‐diisopropenylbenzene ligands, both biaryl‐based axial chirality and π‐arene‐based planar chirality are simultaneously
各种C s对称(π-芳烃)铬底物的钼催化不对称闭环复分解反应提供了相应的桥联平面手性(π-芳烃)铬络合物,ee收率高达99%以上。用大的和非对称的取代基,如ñ吲哚基或1-萘基,在η的2位6 -1,3-二异丙烯基苯的配体,无论是基于二芳基-轴手性的和基于π -芳烃平面手性是同时在产品中诱发。甚至在除去二羰基铬片段后,仍保留了轴向手性,并且在完全保留对映体纯度的情况下获得了手性联芳基/杂联芳基化合物。