3,4-Dichlorophenoxypiperidine (3.09 g) was dissolved in dichloromethane (80 mL). HOBT (1.77 g) and DMAP (0.44 g) were added followed by a solution of 3-cyclopentene-1-carboxylic acid (1.45 g) in dichloromethane (5 mL). EDCI (2.45 g) was added and the solution was stirred for 60 h. Water (100 mL) was added and the phases were separated. The aqueous phase was extracted with dichloromethane (2×40 mL). The organic phases were combined, dried (MgSO4), filtered and evaporated to give subtitle compound (3.40 g) that was used without further purification.
