1: tert-butyl (S)-1-(N-benzyl-N-methylcarbamoyl)-2,2-dimethylpropylcarbamate With hydrogenchloride in 1,4-dioxane T=20°C; 2 h; 2: 3,5-bis(trifluoromethyl)phenyl isothiocyanate With triethylamine in dichloromethane T=20°C; 4 h; Further stages.;