1: (R)-3-piperidinecarboxylic acid ethyl ester (+)-tartrate With sodium hydroxide in water T=5°C; 2: N-(benzyloxycarbonyloxy)-succinimide in tetrahydrofuran; water T=5 - 20°C; 1 h; 3: With hydrogenchloride in water pH=2 - 3;

sodium hydrogencarbonate in tetrahydrofuran; water T=0 - 20°C; 3.5 h;

1: With triethylamine; tert-butyl alcohol 0.5 h; 2: With diphenyl phosphoryl azide T=100°C;