(6R)-3-acetoxymethyl-7t-((Ξ)-5-benzoylamino-5-carboxy-pentanoylamino)-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 、
二苯氯甲烷 在
三乙胺 作用下,
以
liquid sulphur dioxide 为溶剂,
生成 (6R)-3-acetoxymethyl-7t-((Ξ)-5-benzhydryloxycarbonyl-5-benzoylamino-pentanoylamino)-8-oxo-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester