Hydrazine hydrate (1:1) → 8-(4-((Dimethylamino)methyl)phenyl)-5-fluoro-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 ethyl 2-(4-((dimethylamino)methyl)phenyl)-7-fluoro-3-(4-fluorophenyl)-4-oxo-1,2,3,4-tetrahydroquinoline-5-carboxylate (100 mg) in 85% hydrazine monohydrate (0.5 mL) and methanol (2 mL) was stirred at room temperature overnight. Methanol was removed under reduced pressure. The crude was purified by prep-HPLC to give the title compound (35 mg, yield 37%). LC-MS (ESI) m/z: 433 (M+1)+. 1H-NMR (400 MHz, CD3OD) δ (ppm): 2.12 (s, 3H), 3.35 (s, 2H), 4.21 (d, J=8.0 Hz, 1H), 4.64 (d, J=8.0 Hz, 1H), 6.81-6.85 (m, 3H), 6.99-7.01 (m, 2H), 7.13-7.19 (m, 5H); 19F-NMR (400 MHz, CD3OD) δ (ppm): −105.66 (s), −118.17 (s).

Provenance & Evidence