amines catalyzed the asymmetric Michael addition of ethyl 2-fluoro-2-nitroacetate to enones to provide chiral α-fluoro-α-nitro ester ketones with two contiguous stereogenic centers, one of which is a fluorinated quaternary chiral center, with excellent enantioselectivities and in moderate to good yields.
伯胺催化2-
氟-2-
硝基乙酸乙酯向烯酮的不对称迈克尔加成,从而提供具有两个连续的立体中心的手性α-
氟-α-硝基酯酮,其中一个是
氟化的季手性中心,具有出色的对映选择性和中等至良好的产量。