(5
R)-6-benzyloxycarbonylmethylene-3,3-dimethyl-7-oxo-(5
rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2
c-carboxylic acid 2,2,2-trichloro-ethyl ester 在
palladium on activated charcoal 、 rhodium on alumina
吡啶 、
氢气 、
N,N'-二异丙基碳二亚胺 作用下,
以
乙酸乙酯 为溶剂,
生成
(5R)-3,3-dimethyl-7-oxo-6t-(thiophen-2-ylmethoxycarbonyl-methyl)-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2c-carboxylic acid 2,2,2-trichloro-ethyl ester