(2S,3S,4R)-2-Acetoxymethyl-3-((1S,3R,4R)-4,5-diacetoxy-1-methoxy-3-methyl-pentyl)-3-hydroxy-1,4-dimethyl-5-oxo-pyrrolidine-2-carboxylic acid methyl ester 、
4-溴苯甲酰氯 在
ammonium hydroxide 作用下,
生成
(2S,3S,4R)-2-(4-Bromo-benzoyloxymethyl)-3-((1S,3R,4R)-4,5-diacetoxy-1-methoxy-3-methyl-pentyl)-3-hydroxy-1,4-dimethyl-5-oxo-pyrrolidine-2-carboxylic acid methyl ester