A mixture of 0.011 g (0.027 mmol) of {4-[5-chloro-3-(3-chloro-benzoylamino)-pyridin-2-yl]-piperazin-1-yl}-acetic acid in N,N-dimethylformamide (1 mL), 0.011 g (0.13 mmol) of piperdine, 0.011 g (0.10 mmol) of O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate, and 0.011 mL (0.081 mmol) of triethylamine is stirred at room temperature for 4 hours. The mixture is concentrated under reduced pressure and the residue is diluted with water causing a solid to precipitate from solution. The material is collected by filtration, washed with water and dried on the filter pad to provide 0.0060 g (47%) of the title compound (282) as a colorless solid. [M+H]+=476.2.
