(2R,5S,6S)-7-Ethoxycarbonyl-6-tert-butoxycarbonylmethyl-8-oxo-2-phenyl-3-oxa-1-azabicyclo[3.3.0]octane 、
1-苄基-3-碘哌啶-2-酮 在
sodium hydride 作用下,
以
四氢呋喃 为溶剂,
以19%的产率得到(2R,5S,6S,7R)-7-(N-Benzyl-2-oxopiperidin-3-yl)-6-tert-butoxycarbonylmethyl-7-ethoxycarbonyl-3-oxa-8-oxo-2-phenyl-1-azabicyclo[3.3.0]octane