Tert-butyl ((4S,6S)-4-(5-bromo-2-fluoropyridin-3-yl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-yl)carbamate 、
三氟乙酸 在
二氯甲烷 、 Brine 、
Sodium sulfate-III 、 crude material 作用下,
反应 0.25h,
以to give (4S,6S)-4-((5-bromo-2-fluoropyridin-3-yl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine (1.30 g, 3.47 mmol, 83% yield)的产率得到(5-bromo-2-fluoropyridin-3-yl)-4-(fluoromethyl)-6-(trifluoromethyl)-5,6-dihydro-4H-1,3-oxazin-2-amine