反应详情

温度

70 °C

2-[3,4-bis(methyloxy)phenyl]-3-oxopropanenitrile (100 mg, 0.49 mmol) was dissolved in ethanol (1 mL), and anhydrous hydrazine (98%, 19 μL, 0.52 mmol) was added. The resulting mixture was heated at reflux for 1 hour. It was cooled, concentrated, and the residue was dried in vacuum for one hour. To this residue was added of 4-hydroxybenzaldehyde (89 mg, 0.61 mmol) and trifluoroacetic acid (1 mL), and the mixture was heated at 70° C. for 18 hours. Then the reaction mixture was concentrated, dissolved in 10 mL of N,N-dimethylformamide and purified by preparatory HPLC (Shimadzu LC-8A HPLC, Waters Xterra C18 30 mm×100 mm column, acetonitrile-water-trifluoroacetic eluent). After concentration and lyophillization of the pure fractions 4-[7,8-bis(methyloxy)-3H-pyrazolo[3,4-c]isoquinolin-5-yl]phenol trifluoroacetic acid salt (60 mg, 0.15 mmol, 31% yield) was obtained. 1H NMR (400 MHz, d6-DMSO): 8.62 (s, 1H), 7.90 (s, 1H), 7.62-7.60 (d, 2H), 7.48 (s, 1H), 6.98-6.96 (d, 2H), 4.06 (s, 3H), 3.78 (s, 3H); MS (EI) for C18H15N3O3: 322 (MH+).

1. temperatureThe resulting mixture was heated
2. temperatureat reflux for 1 hour
3. temperatureIt was cooled
4. concentrationconcentrated
5. customthe residue was dried in vacuum for one hour
6. concentrationThen the reaction mixture was concentrated
7. dissolutiondissolved in 10 mL of N,N-dimethylformamide
8. custompurified by preparatory HPLC (Shimadzu LC-8A HPLC, Waters Xterra C18 30 mm×100 mm column, acetonitrile-water-trifluoroacetic eluent)