Acetic Acid → HCID 117676244, compound

Participants

Reaction Steps

Methyl 5-((4,8-dichlorophthalazin-1-yl)loxy)-2-fluorobenzoate (5d) (700 mg, 1.9 mmol), acetic acid (20 mL) and sodium acetate (420 mg, 3 mmol) were added into a reaction flask successively, the mixture was refluxed for one hour, and diluted with 50 mL ethyl acetate. The reaction solution was washed with 50 mL saturated sodium bicarbonate solution and saturated sodium chloride solution successively for three times, the organic layers were combined, concentrated and dried to give methyl 5-((8-chloro-4-oxo-3,4-dihydrophthalazin-1-yl)oxy)-2-fluorobenzoate (5e), 650 mg white solid (yield 95%). 1H NMR (600 MHZ, DMSO-d6): δ 12.12 (s, 1H), 8.13 (d, J=8.0 Hz, 1H), 7.95-8.00 (m, 1H), 7.83-7.87 (m, 1H), 7.74-7.77 (m, 1H), 7.61-7.64 (m, 1H), 7.42-7.47 (m, 1H), 3.86 (s, 3H); ESI-MS m/z; calculated for 348.0. found 371.6 [M+Na]+.

Provenance & Evidence