Acetic Acid → 8-(4-((dimethylamino)methyl)phenyl)-9-(4-fluorophenyl)-8,9-dihydro-2H-pyrido[4,3,2-de]phthalazin-3(7H)-one

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Reaction Steps

A mixture of 4-(9-(4-fluorophenyl)-3-oxo-3,7,8,9-tetrahydro-2H-pyrido[4,3,2-de]phthalazin-8-yl)benzaldehyde (80 mg, 0.21 mmol), dimethylamine (47 mg, 1.04 mmol) and acetic acid (62 mg, 1.04 mmol) in methanol (50 mL) was stirred at room temperature for 60 min. Then the mixture was cooled to 0° C. Sodium cyanoborohydride (20 mg, 0.3 mmol) was added. After the addition, the mixture was stirred at room temperature for overnight. Methanol was removed under reduced pressure. The crude product was purified by pre-HPLC to give 8-(4-((dimethylamino)methyl)phenyl)-9-(4-fluorophenyl)-8,9-dihydro-2H-pyrido[4,3,2-de]phthalazin-3(7H)-one (21 mg, yield 24%). 1H-NMR (400 MHz, CD3OD) δ (ppm): 2.82 (s, 6H), 4.26 (s, 2H), 4.32 (d, J=8.0 Hz, 1H), 4.77 (d, J=8.0 Hz, 1H), 6.93-6.95 (m, 2H), 7.10-7.11 (m, 2H), 7.23 (m, 1H), 7.40-7.41 (m, 4H), 7.59 (d, J=8.0 Hz, 1H), 7.65 (t, J=8.0 Hz, 1H). 19F-NMR (400 MHz, CD3OD) δ (ppm): −77.09, −118.00; LC-MS (ESI) m/z: 415 (M+1)+.

Provenance & Evidence