A solution of 2-(3-(4-fluorobenzyl)-2-oxoimidazolidin-1-yl)isonicotinic acid (0.35 g, 1.11 mmol), diisopropylethylamine (0.86 g, 6.66 mmol), 1-hydroxybenzotriazole monohydrate (0.39 g, 2.89 mmol) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.28 g, 1.44 mmol) in anhydrous N,N-dimethylformamide (10.0 mL) was stirred at ambient temperature for 10 minutes, followed by the addition of oxazol-4-ylmethanamine (0.23 g, 1.67 mmol). The resulting reaction mixture was stirred at ambient temperature for 17 hours and concentrated in vacuo. The residue was dissolved in ethyl acetate (60 mL), washed with saturated aqueous sodium bicarbonate (10 mL) solution, water (2×10 mL) and brine (10 mL). The organic solution was dried over anhydrous sodium sulphate, filtered and concentrated in vacuo. The residue was purified by column chromatography to give 2-(3-(4-fluorobenzyl)-2-oxoimidazolidin-1-yl)-N-(oxazol-4-ylmethyl)isonicotinamide as a colorless solid (0.21 g, 49%): mp 197-199° C.; 1H NMR (300 MHz, DMSO-d6) δ 9.15 (t, J=5.6 Hz, 1H), 8.65 (s, 1H), 8.37-8.30 (m, 2H), 7.95 (s, 1H), 7.35-7.06 (m, 5H), 4.49-4.33 (m, 4H), 3.93 (t, J=8.0 Hz, 2H), 3.37-3.25 (m, 2H); 13C NMR (75 MHz, DMSO-d6) δ 165.6, 163.6, 160.4, 156.8, 153.5, 152.5, 148.4, 143.3, 137.8, 136.6, 133.6, 133.6, 130.4, 130.3, 116.0, 115.7, 115.2, 110.5, 46.6, 41.6, 35.7; MS (ES+) m/z 396.3 (M+1).
