ethyl 5-[[[[(3R,5S)-7-chloro-5-(2,3-dimethoxyphenyl)-1(2,2-dimethyl-3-hydroxypropyl)-2-oxo-1,2,3,5-tetrahydro-4-1-benzoxazepin-3-yl]acetyl]amino]methyl]furan-2-carboxylate 、 ammonium chloride 在
sodium hydroxide 作用下,
以
methanol (10 ml)-tetrahydrofuran 为溶剂,
以65%的产率得到5-[[[[(3R,5S)-7-chloro-5-(2,3-dimethoxyphenyl)-1-(2,2-dimethyl-3-hydroxypropyl)-2-oxo-1,2,3,5-tetrahydro-4,1-benzoxazepin-3-yl]acetyl]amino]methyl]furan-2-carboxylic acid