Water → HCID 22052252, compound

Participants

Reaction Steps

To a mixture of 1.969 g 2-ethyl-3-(4-fluoro-phenyl)-5-methyl-3H-quinazolin-4-one (IX) (6.974 mmol, 1.000 equiv) and 0.687 g sodium acetate (8.37 mmol, 1.20 equiv) in 28 mL glacial acetic acid at 40° C. (external temperature, oil bath) was added a solution of 0.372 mL bromine (7.32 mmol, 1.05 equiv) dissolved in 5 mL glacial acetic acid dropwise by addition funnel over 30 min. After 2 h the reaction solution was poured into 250 mL water. The resulting mixture was stirred vigorously at room temperature for 1 h, after which time the precipitate was collected by vacuum filtration, rinsing with warm (ca. 40° C.) water (3×50 mL). The solid was dried in vacuo over phosphorous pentoxide overnight, affording 2.19 g of a white solid. m.p. decomposes upon heating. 1H NMR (CDCl3) δ2.04 (d, 3H, J=6.8 Hz), 2.82 (s, 3H), 4.51 (q, 1H, J=6.8 Hz), 7.15 (ddd, 1H, J1=2.4 Hz, J2=4.4 Hz, J3=8.4 Hz), 7.23 (dd, 1H, J1=2.8 Hz, J2=10.8 Hz), 7.25-7.31 (m, 2H), 7.56 (ddd, J1=2.8 Hz, J2=4.8 Hz, J3=8.8 Hz), 7.64 (2×d, 2×1H, J=5.2 Hz) ppm. MS (ESI+) 361.1 [MH]+.

Provenance & Evidence