Triethylamine → HCID 66593845, compound

2-(1H-Benzo[d][1,2,3]triazol-1-yl)-1,1,3,3-tetramethylisouronium hexafluorophosphate(V) (0.379 g, 1.00 mmol) was added to 3-((4-oxo-3,4-dihydrophthalazin-1-yl)methyl)benzoic acid (1b) (0.200 g, 0.71 mmol), 4-ethoxypiperidine (0.101 g, 0.78 mmol) and triethylamine (0.249 mL, 1.78 mmol) in DMF (3 mL). The resulting solution was stirred at room temperature for 3 days. The crude product was purified by preparative HPLC (Waters XBridge Prep C18 OBD column, 5μ silica, 19 mm diameter, 100 mm length), using decreasingly polar mixtures of water (containing 1% NH3) and MeCN as eluents. Fractions containing the desired compound were evaporated to dryness to afford the desired compound (0.175 g, 62.6% yield); 1H NMR (400.132 MHz, DMSO) δ 1.11 (3H, t), 1.20-1.93 (4H, m), 2.98-3.27 (2H, m), 3.33-3.41 (1H, m), 3.42-3.54 (3H, m), 3.93 (1H, s), 4.35 (2H, s), 7.21 (1H, m), 7.31 (1H, s), 7.33-7.42 (2H, m), 7.79-7.90 (2H, m), 7.95 (1H, m), 8.26 (1H, m), 12.58 (1H, s); m/z (LC-MS, ESI+), RT=1.81 min (M+H=392.13).