反应详情

To 67 mg (0.34 mmol) of (2,3-dimethoxyphenyl)acetic acid in 1 mL of CH2Cl2 was added 32 μL (0.37 mmol) of oxalyl chloride. The solution was stirred at ambient temperature for 20 minutes then added to a solution of 60 mg (0.28 mmol) of 4,6-diamino-2-ethoxy-nicotinonitrile in 0.5 mL of pyridine. The mixture was complete within 5 minutes though some diaminopyridine remained. The solvent was removed under reduced pressure, then the residue was taken up in 10 mL of ethyl acetate and extracted with water (2×5 mL), saturated NaHCO3(aq.) (1×5 mL), and brine (1×5 mL), dried over MgSO4, filtered, and concentrated to an oil. This was recrystallized from 8 mL of methanol to provide 35 mg (35%) of white crystals. 1H NMR (300 MHz, d6-DMSO) δ 10.22 (s, 1H), 7.15 (s, 1H), 6.97 (m, 2H), 6.88 (s, 2H), 6.81 (dd, 1H, J=7.1, 2.0 Hz), 4.35 (q, 2H, J=7.1 Hz), 3.79 (s, 3H), 3.71 (s, 2H), 3.68 (s, 3H), 1.31 (t, 3H, J=7.1 Hz); MS (ESI) m/e=327 (M−Et+H)+, 357 (M+H)+.

1. customThe solvent was removed under reduced pressure
2. extractionextracted with water (2×5 mL), saturated NaHCO3(aq.) (1×5 mL), and brine (1×5 mL)
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated to an oil
6. customThis was recrystallized from 8 mL of methanol