1: (1R,2S)-1-(4-methylsulfonylphenyl)-2-benzylamino-3-fluoro-1-propanol With sulfuric acid; hydrogen; palladium on activated charcoal in ethanol T=20°C; 2 h; 2: dichloroacetic acid ethyl ester With triethylamine in methanol T=30°C; 6 h; Further stages.;