Enantioselective synthesis of a chiral fluoropiperidine via asymmetric hydrogenation of a vinyl fluoride
作者:Shane W. Krska、Jeffrey V. Mitten、Peter G. Dormer、Dale Mowrey、Fouzia Machrouhi、Yongkui Sun、Todd D. Nelson
DOI:10.1016/j.tet.2009.06.105
日期:2009.10
Asymmetric hydrogenation of a vinyl fluoride derivative gives efficient access to enantioenriched 1,3,4-trisubstituted piperidine 1 with a stereogenic alkyl fluoride center. Extensive catalystscreening across transition metals and chiral ligands identified only one catalyst, a Rh/Walphos complex, that gives high conversion, enantioselectivity and chemoselectivity for olefin reduction over defluorination