反应详情

A 0° C. solution of Example A5 (200 mg, 0.58 mmol) and pyridine (91 mg, 1.16 mmol) in DCM (4 mL) was treated drop-wise with 1,3-difluoro-5-isocyanato-benzene (98 mg, 0.64 mmol) and stirred at RT overnight as the cooling bath expired. The mixture was concentrated to dryness and purified by prep-HPLC. The resulting solution was treated with HCl (1 mL) and lyophilized to give 1-(4-chloro-5-(1-ethyl-7-(methylamino)-2-oxo-1,2-dihydro-1,6-naphthyridin-3-yl)-2-fluorophenyl)-3-(3,5-difluorophenyl)urea hydrochloride (74 mg, 26% yield). 1H NMR (400 MHz, DMSO-d6): δ 9.94 (s, 1H), 9.03 (s, 1H), 8.54 (s, 1H), 8.14 (b s, 1H), 8.13 (d, J=8.8 Hz, 1H), 7.88 (s, 1H), 7.57 (d, J=11.2 Hz, 1H), 7.16-7.12 (m, 2H), 6.78 (t, J=8.8 Hz, 1H), 6.57 (s, 1H), 4.16-4.13 (m, 2H), 2.96 (s, 3H), 1.19 (t, J=6.8 Hz, 3H); MS (ESI) m/z: 502.3 [M+H]+.

1. concentrationThe mixture was concentrated to dryness
2. custompurified by prep-HPLC
3. additionThe resulting solution was treated with HCl (1 mL)