Asymmetric Synthesis of Cyclopropanes with a Monofluorinated Quaternary Stereocenter
作者:Pavel Ivashkin、Samuel Couve-Bonnaire、Philippe Jubault、Xavier Pannecoucke
DOI:10.1021/ol3024264
日期:2012.10.5
New chiral fluorinated reagents (N-(dibromofluoroacetyl)oxazolidinones) were easily synthesized and used in an asymmetric cyclopropanation process. The Michael initiated ring closure reaction provided chiral cyclopropanes bearing a fluorinated quaternary stereocenter. Various electron-deficient alkenes can be used to efficiently obtain chiral polysubtituted fluorinated cyclopropanes in good yields
新的手性氟化试剂(N-(二溴氟乙酰基)恶唑烷酮)很容易合成,并用于不对称环丙烷化过程中。迈克尔引发的闭环反应提供了带有氟化四元立体中心的手性环丙烷。各种缺电子的烯烃可用于以良好的收率有效地获得手性多取代的氟化环丙烷。对于每种异构体,以高水平的非对映选择性获得了中等至非常好的顺式/反式比率。