Reaction Steps
A mixture of 4-(9-(3-(4-(cyclopropanecarbonyl)piperazine-1-carbonyl)phenyl)-3-oxo-3,7,8,9-tetrahydro-2H-pyrido[4,3,2-de]phthalazin-8-yl)benzaldehyde (20 mg, 0.04 mmol) and 33% dimethylamine aq solution (10 mg, 0.07 mmol) in methanol (10 mL) was stirred at room temperature for 40 min. Then the mixture was cooled to 0° C. Sodium borohydride (2 mg, 0.06 mmol) was added. After the addition, the mixture was stirred at this temperature for 2 hr. Methanol was removed under reduced pressure. The residue was washed with ethyl acetate/methanol (10/1) and filtered. The filtrate was concentrated to give the crude product. The crude product was purified by prep-HPLC to give the compound 9-(3-(4-(cyclopropanecarbonyl)piperazine-1-carbonyl)phenyl)-8-(4-((dimethylamino)methyl)phenyl)-8,9-dihydro-2H-pyrido[4,3,2-de]phthalazin-3(7H)-one (4 mg, yield 19%) and 9-(3-(4-(cyclopropanecarbonyl)piperazine-1-carbonyl)phenyl)-8-(4-(hydroxymethyl)phenyl)-8,9-dihydro-2H-pyrido[4,3,2-de]phthalazin-3(7H)-one (2 mg, yield 9%) as light yellow solids. 9-(3-(4-(cyclopropanecarbonyl)piperazine-1-carbonyl)phenyl)-8-(4-((dimethylamino)methyl)phenyl)-8,9-dihydro-2H-pyrido[4,3,2-de]phthalazin-3(7H)-one: 1H-NMR (400 MHz, CD3OD) δ (ppm): 0.83-0.91 (m, 4H), 1.94-2.03 (m, 1H), 2.81 (s, 6H), 3.18-3.23 (m, 1H), 3.35-3.79 (m, 7H), 4.26 (s, 2H), 4.40 (d, J=7.6 Hz, 1H), 4.82 (d, J=7.2 Hz, 1H), 7.22-7.29 (m, 4H), 7.31-7.33 (m, 1H), 7.37-7.45 (m, 4H), 7.58-7.60 (d, J=8.0 Hz, 1H), 7.64-7.68 (t, J=8.0 Hz, 1H); LC-MS (ESI) m/z: 577(M+1)+. 9-(3-(4-(cyclopropanecarbonyl)piperazine-1-carbonyl)phenyl)-8-(4-(hydroxymethyl)phenyl)-8,9-dihydro-2H-pyrido[4,3,2-de]phthalazin-3(7H)-one: 1H-NMR (400 MHz, CD3OD) δ (ppm): 0.83-0.91 (m, 4H), 1.94-2.01 (m, 1H), 3.11-3.14 (m, 1H), 3.35-3.79 (m, 7H), 4.37-4.40 (d, J=10.0 Hz, 1H), 4.55 (s, 2H), 4.38 (d, J=7.6 Hz, 1H), 4.73-4.76 (d, J=9.6 Hz, 1H), 7.12 (s, 1H), 7.20-7.30 (m, 7H), 7.34-7.38 (t, J=8.0 Hz, 1H), 7.56-7.58 (d, J=7.6 Hz, 1H), 7.62-7.66 (t, J=8.0 Hz, 1H); LC-MS (ESI) m/z: 550(M+1)+.
