To a solution of 7-(2-naphthoyl)heptanoic acid 50 g (1.00 g, 3.52 mmol) in DMF (15 mL) were added HOBT (950 mg, 7.04 mmol) and EDC (1.00 g, 5.28 mmol). The mixture was stirred at room temperature for 1 hour, after which 1,2-phenylenediamine (760 mg, 7.04 mmol) was added and the solution was stirred at room temperature for 16 hours. The DMF was evaporated under high vacuum, deionized water was added, and the mixture was extracted with ethyl acetate (2×30 mL). The combined organic layers were washed with saturated sodium bicarbonate (20 mL), washed with brine (20 mL), and dried (MgSO4). The solvents were removed in vacuo and the title compound 63 (558 mg, 42%) was isolated by recrystallization from acetone and dichloromethane. 1H NMR (300 MHz, 20% CD3OD in CDCl3): δ 8.47 (s, 1H), 8.10-7.85 (m, 4H), 7.63-7.50 (m, 2H), 7.14-6.70 (m, 4H), 3.11 (t, J=7.2 Hz, 2H), 2.39 (t, J=7.5 Hz, 2H), 1.77 (m, 4H), 1.46 (m, 4H). 13C NMR (75 MHz, 20% CD3OD in CDCl3): δ 23.99, 25.40, 28.66, 28.74, 36.08, 38.23, 117.69, 119.09, 123.45, 124.01, 125.34, 126.53 126.86, 127.45, 128.19, 128.23, 129.28, 129.56, 132.23, 133.85, 135.32, 140.58, 172.81, 201.11.
