To a stirred solution of azetidine-1,3-dicarboxylic acid mono-tert-butyl ester (0.072 g, 0.36 mmol) in 15 mL of CH2Cl2 was added (0.069 g, 0.36 mmol) of EDC, (0.048 g, 0.36 mmol) of HOBt and Et3N (0.06 mL, 0.42 mmol). After one hour at RT, was added 6-{(SR)-1-[(3RS,4SR)-4-(3,4-dichloro-phenyl)-pyrrolidin-3-yl]-ethoxy}-nicotinonitrile (VII-B-2, 0.10 g, 0.27 mmol). The mixture was stirred at RT over night and then poured onto water and extracted with CH2Cl2. The combined organic phases were dried over Na2SO4 and concentrated under vacuo. Column chromatography (SiO2, EtOAc/H, 1:1) yielded 0.14 g (98%) of the title compound as a white solid. ES-MS m/e: 545.3 (M+H+).
