反应详情

To N-{3-[2-amino-5-(2-chloro-4-pyrimidinyl)-1,3-thiazol-4-yl]phenyl}-2,6-difluorobenzene sulfonamide (0.8 g, 1.67 mmol) in 10 mL THF was added t-butylnitrite (0.4 mL, 4 mmol) by syringe. The mixture stirred at rt for 1 h. More t-butylnitrite (0.2 mL, 2 mmol) was added and the mixture heated to 80° C. for 1 h. The mixture was cooled, diluted with 100 mL EtOAc, washed with 20 mL water, filtered through Whatman 1 PS (phase separating) paper and concentrated under vacuum. The crude product was then purified by flash chromatography to give the title compound of Step B (0.53 g, 1.14 mmol, 65% yield). 1H NMR (400 MHz, DMSO-d6) δ ppm 11.07 (s, 1H), 9.37 (s, 1H), 8.55 (d, J=5.3 Hz, 1H), 7.65-7.75 (m, 1H), 7.40 (t, J=8.0 Hz, 1H), 7.23-7.32 (m, 5H), 7.03 (d, J=5.3 Hz, 1H).

1. temperaturethe mixture heated to 80° C. for 1 h
2. temperatureThe mixture was cooled
3. washwashed with 20 mL water
4. filtrationfiltered through Whatman 1 PS (phase separating) paper
5. concentrationconcentrated under vacuum
6. customThe crude product was then purified by flash chromatography