Hydrochloric Acid → 2-Fluoro-5-(4-oxo-3,4,5,6,7,8-hexahydro-phthalazin-1-ylmethyl)-benzoic acid

Participants

Reaction Conditions

Reaction Steps

To a suspension of EXAMPLE 1C (1.46 g) in water (15 mL) was added 50% sodium hydroxide. The mixture was heated at 90° C. for 1 hour. After cooling to 70° C., hydrazine monohydrate (0.54 mL) was added, and the solution was stirred at 70° C. for 17 hours. The solution was cooled to ambient temperature and brought to pH 4 with 6N hydrochloric acid. The precipitate was filtered, washed with water and dried. 1H NMR (DMSO-d6) δ1.55-1.69 (m, 4H), 2.31-2.42 (m, 4H), 3.93 (s, 2H), 7.24 (dd, J=10.8, 8.5 Hz, 1H), 7.40-7.48 (m, 1H), 7.68 (dd, J=6.9, 2.2 Hz, 1H), 12.61 (s, 1H), 13.22 (brs, 1H).

Provenance & Evidence