2,4-Dichlorobenzyl isocyanate → N-(8-bromo-5-isoquinolinyl)-N'-(2,4-dichlorobenzyl)urea

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Reaction Steps

The product from Example 73A (120 mg, 0.52 mmol) in THF:toluene (1:4, 5 mL) was treated with a solution of 2,4-dichloro-1-(isocyanatomethyl)benzene (108 mg, 0.52 mmol) in THF (0.5 mL). After stirring for 16 hours at room temperature, the mixture was filtered and the filter cake dried under reduced pressure to provide the title compound as a white solid (178 mg, 78%). The hydrochloride salt was obtained by dissolving the product in hot THF and adding HCl in diethyl ether (2M). The yellow precipitate was collected by filtration and dried under reduced pressure. MS (ESI+) m/z 426 (M+H)+; MS (ESI−) m/z 424 (M−H)−; 1H NMR (DMSO-d6, 300 MHz) δ 4.42 (d, 5.8, 2H), 7.22 (t, J 5.8, 1H), 7.65 (m, 1H), 7.91 (d, J 8.5, 1H), 8.02 (d, J 6.1, 1H), 8.22 (d, J 8.5, 1H), 8.69 (d, J 5.8, 1H), 9.01 (s, 1H), 9.44 (s, 1H); Anal. Calcd for C17H12BrCl2N3O HCl 0.25 EtOH: C, 44.41; H, 3.14; N, 8.88 Found: C, 44.80; H, 2.76; N, 8.84.

Provenance & Evidence