Hydrazine hydrate (1:1) → HCID 136385312, compound

Participants

Reaction Steps

A mixture of methyl 4-oxo-2,3-di(pyridin-3-yl)-1,2,3,4-tetrahydroquinoline-5-carboxylate and ethyl 4-oxo-2,3-di(pyridin-3-yl)-1,2,3,4-tetrahydroquinoline-5-carboxylate (480 mg, 1.34 mmol) in hydrazine monohydrate (20 mL) and methanol (5 mL) was heated to reflux for 2 hr. The mixture was then cooled to room temperature and filtered to give 8,9-di(pyridin-3-yl)-8,9-dihydro-2H-pyrido[4,3,2-de]phthalazin-3(7H)-one (320 mg, yield 68%) as a light yellow solid. 1H-NMR (400 MHz, DMSO-d6) δ 4.51-4.53 (d, J=8.4 Hz, 1H), 4.89-4.91 (d, J=8.4 Hz, 1H), 7.18-7.20 (m, 1H), 7.24-7.27 (m, 1H), 7.31-7.33 (m, 1H), 7.43-7.44 (m, 1H), 7.60 (s, 1H), 7.58-7.63 (m, 2H), 7.79-7.81 (m, 1H), 8.32-8.34 (m, 2H), 8.41-8.43 (m, 1H), 8.45-8.46 (d, J=1.6 Hz, 1H); LC-MS (ESI) m/z: 342(M+1)+.

Provenance & Evidence