Hydrogen Bromide → HCID 68576450, compound

Participants

Reaction Steps

To a suspension solution of 6-fluoroquinolin-4-ol (3.67 g, 22.5 mmol) (synthesized in overall yield of 32% starting from 4-fluoroaniline and diethyl ethoxymethylenemalonate according to a literature procedure (see Price et al., Organic Syntheses, Coll. Vol. 3, p. 272; Vol. 28, p. 38), triphenylphosphine (6.56 g, 25 mmol), and 3-bromo-1-propanol (2.3 mL, 25 mmol) in dry tetrahydrofuran (30 mL) was added diisopropyl azodicarboxylate (4.9 mL, 25 mmol) at 25° C. over 30 minutes under nitrogen and the reaction mixture was left stirring for one hour. Hydrobromic acid (2.8 mL of 48% aqueous solution, 25 mmol) was added, resulting in precipitation of the titled compound. The product was collected by suction filtration and washed with THF, acetone and ether to give a light yellow crystalline solid (4.17 g, 51%). 1H NMR (400 MHz, DMSO-d6): 2.45 (2H, m), 3.82 (2H, t, J=6.5 Hz), 4.61 (2H, t, J=5.7 Hz), 7.64 (1H, d, J=6.6 Hz), 8.40 (1H, dt, J=8.5, 2.7 Hz), 7.90 (m, 1H), 8.27 (1H, dd, J=9.4, 4.8 Hz), 9.24 (1H, d, J=6.6 Hz).

Provenance & Evidence