ethyl 3-[3-[[[(3R,5S)-1-(3-acetoxy-2,2-dimethylpropyl)-7-chloro-5-(2,3-dimethoxyphenyl)-2-oxo-1,2,3,5-tetrahydro-4,1-benzoxazepin-3-yl]acetyl]amino]-2-methylphenyl]propionate 、
sodium hydroxide 、
乙醇 在
乙酸乙酯 、 Brine 、
Sodium sulfate-III 、 silica gel 、
甲醇乙酸乙酯 作用下,
以
水 为溶剂,
反应 0.5h,
以to obtain 3-[3-[[[(3R,5S)-7-chloro-5-(2,3-dimethoxyphenyl)-1-(3-hydroxy-2,2-dimethylpropyl)-2-oxo-1,2,3,5-tetrahydro-4,1-benzoxazepin-3-yl]acetyl]amino]-2-methylphenyl]propionic acid (0.54 g, 0.845 mmol, 60%) as a colorless amorphous powder的产率得到3-[3-[[[(3R,5S)-7-chloro-5-(2,3-dimethoxyphenyl)-1-(3-hydroxy-2,2-dimethylpropyl)-2-oxo-1,2,3,5-tetrahydro-4,1-benzoxazepin-3-yl]acetyl]amino]-2-methylphenyl]propionic acid