“…A few literature reports are available for the enantioselective synthesis of 1, in which the chiral center was developed by chiral poll approach [6,7,8], asymmetric hydrosilylation of imine [9,10,11], asymmetric reductive acylation of a ketoxime [12], diastereoselective addition of Grignard reagent [13], organolithium and dimethylzinc to imines bearing a chiral auxiliary [14,15,16], reductive amination of aromatic ketone [17,18,19], diastereoselective Nalkylation of amines with racemic alcohol [20,21], chiral ligand-promoted cobalt-catalysed radical hydroamination of alkene [22] or enantioselective arylation of aliphatic imines [23]. However, most of these methods have several drawbacks, such as tedious and time consuming experiments, unavailability or expensive chiral starting materials, low yield and lower enantiomeric purity, etc.…”