Reaction Steps
To a stirred solution of 320 (150 mg, 0.31 mmol), aniline (43 μL, 0.47 mmol) and N, N-diisopropylethylamine (0.19 mL, 1.09 mmol) in dry N,N-dimethylformamide (4 mL) at room temperature was added HATU reagent (356 mg, 0.94 mmol). The mixture was stirred at room temperature for 16 h. A saturated aqueous solution of sodium bicarbonate was added and the aqueous solution was extracted twice with EtOAc, dried over anhydrous sodium sulfate and the solvent was removed under reduced pressure. The residue was purified by column chromatography on silica gel (eluent MeOH-dichloromethane, gradient 3:97 to 8:92) to afford the title compound 317 (111 mg, 0.20 mmol, 64% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm: 10.11 (s, 1H), 8.39 (d, J=5.6 Hz, 1H), 7.85 (d, J=1.2 Hz, 1H), 7.72 (d, J=0.8 Hz, 1H), 7.66 (s, 1H), 7.56 (d, J=7.2 Hz, 2H), 7.30 (t, J=8.0 Hz, 2H), 7.21 (t, J=8.8 Hz, 1H), 7.05 (t, J=7.2 Hz, 1H), 6.86 (dd, J=13.6, 2.4 Hz, 1H), 6.67 (dd, J=8.8, 2.0 Hz, 1H), 6.57 (d, J=8.8 Hz, 1H), 6.44 (d, J=5.6 Hz, 1H), 4.86-4.53 (m, 1H), 3.72 (s, 3H), 2.92 (dd, J=15.6, 3.2 Hz, 1H), 2.76 (dd, J=15.6, 9.6 Hz, 1H). LRMS (M+1) 556.0 (100%).
