(4R,5S,6S)-3-[(2S,4S)-2-[[2-carboxy-furan-5-ylmethyl]amino]carbonyl-pyrrolidine-4-yl]thio-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 、
碳酸氢钠 、 sodium iodide 在
吡啶 作用下,
以
水 为溶剂,
以79.2%的产率得到(4R,5S,6S)-3-[(2S,4S)-2-[[2-carboxy-furan-5-ylmethyl]amino]carbonyl-pyrrolidine-4-yl]thio-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid mono-sodium salt