1: 4-(2-hydroxy-ethyl)-piperidine-1-carboxylic acid tert-butyl ester With sodium hydride in tetrahydrofuran T=0°C; 1 h; 2: methyl iodide in tetrahydrofuran T=0 - 20°C;

hydrogenchloride in 1,4-dioxane; dichloromethane 21 h;