p-Toluenesulfonic acid → 8-Chloro-3-{3-[5-(4-fluoro-phenyl)-2,5-diaza-bicyclo[2.2.2]oct-2-yl]-propyl}-1H-quinazoline-2,4-dione

Participants

Reaction Conditions

Reaction Steps

8-Chloro-3,4-dihydro-2H-1-oxa-4a,9-diaza-anthracen-10-one (0.35, 1.49 mmol), 2-(4-Fluoro-phenyl)-2,5-diaza-bicyclo[2.2.2]octane (HCl salt) (0.30g, 1.24 mmol), triethylamine (0.21 ml, 1.49 mmol), p-toluene sulfonic acid (0.036 g, 0.187 mmol) were combined in dimethyl acetamide (2 ml) and heated at 120° C. for 15 hours. The reaction was cooled to room temperature, diluted with H2O (200 mL) and extracted with ethyl acetate (3×100 mL). The pooled organic layers were washed with water (3×200 mL),dried over magnesium sulfate, and concentrated to a brown semi-solid. Silica gel flash chromatography using 5% methanol/chloroform as the eluent yielded 8-Chloro-3-{3-[5-(4-fluoro-phenyl)-2,5-diaza-bicyclo[2.2.2]oct-2-yl]-propyl}-1H-quinazoline-2,4-dione (0.18 g, 32.7%) as an light brown solid Maleate salt was formed by dissolving the solid in hot ethyl acetate (5 ml) and maleic acid (0.57 g, 1.2 eq) in ethyl acetate (4 ml) was added. Upon cooling the white solid was filtered to yield the maleate salt (0.12 g) which had the following properties: Mp. 186-188° C.; 1H NMR DMSO-d6 δ: 11.04 (brds, 1H), 9.40 (brd s, 1H), 7.91 (d, J=7.9 Hz, 1H), 7.79 (d, J=7.9 Hz, 1H), 7.20 (t, J=7.9 Hz, 1H), 6.68 (brds, 2H), 6.02 (s, 2H), 4.11 (brds, 1H), 4.02-3.92 (m, 2H), 3.80-3.52 (m, 3H), 3.44-3.17 (m, 4H), 2.18-1.65 9m, 6H). IR(KBr): Analysis calculated for C23H24ClFN4O2* C4H4O4: C, 56.40; H, 4.91; N, 9.74;

Provenance & Evidence