1-(3-chloro-phenyl)-6-(2,4-dimethoxy-benzylamino)-3-methyl-1H-pyrido[2,3-b][1,4]oxazin-2-one 、
二碳酸二叔丁酯 在
4-二甲氨基吡啶 作用下,
以to give [1-(3-chloro-phenyl)-3-methyl-2-oxo-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-6-yl]-(2,4-dimethoxy-benzyl)-carbamic acid tert-butyl ester as a pale yellow solid (4.2 g)的产率得到[1-(3-chloro-phenyl)-3-methyl-2-oxo-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-6-yl]-(2,4-dimethoxy-benzyl)-carbamic acid tert-butyl ester