<5-acetoxy-3-<<(1,1-dimethylethoxy)carbonyl>amino>-2,3,4,5-tetrahydro-2-oxo-1H-1-benzazepin-1-yl>acetic acid 1,1-dimethylethyl ester 在
盐酸 、
sodium acetate 、 sodium cyanoborohydride 作用下,
生成 2-<<5-acetoxy-1-(carboxymethyl)-2,3,4,5-tetrahydro-2-oxo-1H-1-benzazepin-3-yl>amino>-4-phenylbutanoic acid ethyl ester