Synthesis of (2S,3S)-β-(trifluoromethyl)-α,β-diamino acid by Mannich addition of glycine Schiff base Ni(II) complexes to N–tert-butylsulfinyl-3,3,3-trifluoroacetaldimine. 
J. Fluorine Chem. 2015, 171, 67–72. DOI: 10.1016/j.jfluchem.2014.09.013
 
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