lithium aluminium tetrahydride in diethyl ether T=0 - 20°C; 16 h;

1: 1-(3,4-dimethoxy-phenyl)-cyclopentanecarbonitrile With lithium aluminium tetrahydride in diethyl ether T=0 - 20°C; 16 h; 2: 4-chloro-butyl chloride in tetrahydrofuran 40 h; Heating / reflux;