1: With lithium aluminium tetrahydride; ethyl acetate in tetrahydrofuran T=0°C; 2: 5-(4-fluorophenyl)pyridine-3-carboxylic acid piperidine amide in tetrahydrofuran T=-7°C; 3 h; 3: With sodium hydroxide; sulfuric acid; water Product distribution / selectivity; more than 3 stages;