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0 °C

To a suspension of Intermediate AA (N-{4-[4-amino-6-(methoxymethyl)pyrrolo[2,1-f][1,2,4]triazin-5-yl]phenyl}-N′-[2-fluoro-5-(trifluoro-methyl)phenyl]urea (750 mg, 1.58 mmol)) in acetonitrile (7 ml) was added N-bromosuccinimide (365 mg, 2.0 mmol) and the mixture was heated at 60 C in a sealed vial for 1 h. After cooling to 0° C., the reaction was filtered and washed with cold CH3CN and ethyl ether (3×) to give the crude product as a solid, which was purified via flash column chromatography (95:5 v/v CH2Cl2-MeOH) to afford additional 50 mg of the title compound. 1H-NMR (DMSO-d6) δ 9.34 (s, 1H), 8.95 (d, J=3 Hz, 1H), 8.6 (m, 1H), 7.98 (s, 1H), 7.60 (d, J=3 Hz, 1H), 7.57 to 7.58 (m, 1H), 7.49 (m, 1H), 7.38 to 7.34 (m, 2H), 4.21 (s, 2H), 3.16 (s, 3H); MS [M+H]+=553; LCMS RT=3.24 min.

1. temperaturethe mixture was heated at 60 C in a sealed vial for 1 h
2. filtrationthe reaction was filtered
3. washwashed with cold CH3CN and ethyl ether (3×)
4. customto give the crude product as a solid, which
5. customwas purified via flash column chromatography (95:5 v/v CH2Cl2-MeOH)