Hydrochloric Acid → HCID 66831343, compound

Participants

Reaction Conditions

Reaction Steps

A heterogeneous mixture of (3-bromo-7-fluoro-4-oxo-4H-pyrido[1,2-a]pyrimidin-2-yl)methyl acetate (7.7539 g, 24.61 mmol), HCl (6.972 mL, 83.67 mmol), and 1,4-dioxane (70.31 mL) was heated under stirring at 70° C. After 4 h, the mixture was cooled to rt and the mixture was concd under reduced pressure. The residue was diluted with water (100 mL) and treated with 28% ammonium hydroxide (10 mL) until pH neutral. The precipitate was filtered, washed with water (300 mL), and dried under high vacuum overnight to give 3-bromo-7-fluoro-2-(hydroxyl-methyl)-4H-pyrido[1,2-a]pyrimidin-4-one as a brown solid: 1H NMR (400 MHz, DMSO-d6) δ ppm 8.97 (1 H, ddd, J=4.9, 2.8, 0.7 Hz), 8.17 (1 H, ddd, J=9.8, 7.1, 2.8 Hz), 7.88 (1 H, ddd, J=9.8, 5.4, 0.7 Hz), 5.35 (1 H, br. s.), 4.60 (2 H, s); Mass Spectrum (ESI) m/e=273.0 [M+1 (79Br)] and 274.9 [M+1 (81Br)].

Provenance & Evidence