2-巯基乙胺 、 alkaline earth salt of/the/ methylsulfuric acid 在
N,N-二异丙基乙胺 作用下,
以
乙腈 为溶剂,
以43%的产率得到(5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-carbamoylmethylsulfanyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester