1: (3S)-3-({[tert-butyl(dimethyl)silyl]oxy}methyl)-1-[(1R)-1-phenylethyl]pyrrolidine With 1-chloroethyl chlorocarbonate in 1,2-dichloro-ethane 5 h; Reflux; 2: With N-ethyl-N,N-diisopropylamine in 1,2-dichloro-ethane 3 h; Reflux; 3: di-tert-butyl dicarbonate With potassium carbonate in tetrahydrofuran; water T=0°C; 3 h;