4-chloro-5-ethyl-1H-imidazole-2-carboxylic acid 、
氯化亚砜 、
ethyl 2-[(7-amino-2,3-dihydro-4H-1,4-benzoxazin-4-yl)methyl]benzoate 在
silica gel 、
ethyl acetate n-hexane 作用下,
以
吡啶 为溶剂,
以to obtain 0.29 g of the title compound as a yellow solid (77%)的产率得到ethyl 2-[(7-{[(4-chloro-5-ethyl-1H-imidazol-2-yl)carbonyl]amino}-2,3-dihydro-4H-1,4-benzoxazin-4-yl)methyl]benzoate