4-(6-Chloro-3-oxo-2,3-dihydro-benzo[1,4]oxazin-4-yl)-piperidine-1-carboxylic acid tert-butyl ester 以
trifluoracetic acid-dichloromethane 为溶剂,
反应 1.0h,
以to give 7.2 g (96%) of a light beige solid的产率得到6-Chloro-4-piperidin-4-yl-4H-benzo[1,4]oxazin-3-one