A mixture of 4-(tert-Butoxycarbonylamino-methyl)-benzoic acid (500 mg, 1.99 mmol), 2-Pyrrolidin-1-yl-ethylamine (0.28 mL, 2.19 mmol), EDC (459 mg, 2.39 mmol), HOBt (323 mg, 2.39 mmol) and triethylamine (0.40 mL, 2.99 mmol) in DMF (10 mL) was stirred at ambient temperature for 15 h. The mixture was diluted with EtOAc (25 mL) and washed with water (25 mL) and NaHCO3 (25 mL). The aqueous mixture was extracted with EtOAc (2×25 mL). The combined organic layers were dried over anhydrous sodium sulfate and concentrated to yield the title compound (421 mg, 61%). m/z (M+1) 348.23.
