Regio- and Stereoselective Ring-Opening Reactions of Epoxides with Indoles and Pyrroles in 2,2,2-Trifluoroethanol
作者:Martin Westermaier、Herbert Mayr
DOI:10.1002/chem.200701366
日期:2008.2.8
Aliphatic and aromatic epoxides react regio- and stereoselectively with indoles and pyrroles in 2,2,2-trifluoroethanol without the use of a catalyst or any other additive. While aromatic epoxides are selectively attacked at the benzylic position, aliphatic epoxides react at the less-substituted position. Chiral epoxides react with >99 % ee (ee=enantiomeric excess).
脂肪族和芳香族环氧化物与吲哚和吡咯在2,2,2-三氟乙醇中的区域和立体选择性反应,无需使用催化剂或任何其他添加剂。尽管芳族环氧化物在苄基位置被选择性地侵蚀,但是脂族环氧化物在取代度较低的位置反应。手性环氧化物与> 99%ee发生反应(ee =对映体过量)。