[2-(8,9-Dioxo-2,6-diazabicyclo[5.2.0]non-1(7)-en-2-yl)ethyl]-phosphonic Acid 、
N,N-二异丙基乙胺 、
苯甲酸 1-氯乙基酯 在
乙酸乙酯 、
碳酸氢钠 、 Brine 、
magnesium sulfate 、 silica gel 、
甲醇 、
氯仿 、
3-{2-[8,9-dioxo-2,6-diazabicyclo[5.2.0]non-1(7)-en-2-yl]ethyl}-1,5-dimethyl-3-oxido-7-oxo-7-phenyl-2,4,6-trioxa-3-phosphahept-1-yl benzoate 作用下,
以
N,N-二甲基甲酰胺 、
柠檬酸 为溶剂,
反应 36.5h,
以afforded 1.66 g (15.5%) of a stereoisomer of [2-[8,9-Dioxo-2,6-diazabicyclo[5.2.0]non-1(7)-en-2-yl]ethyl]-phosphonic acid bis[1-(benzoyloxy)ethyl]ester (example 8) [MS (ES+): m/e 557 (M+H)] and 0.73 g (6.8%) of a less polar diastereoisomer of [2-[8,9-Dioxo-2,6-diazabicyclo[5.2.0]non-1(7)-en-2-yl]ethyl]-phosphonic acid bis[1-(benzoyloxy)ethyl]ester (example 9) [MS (ES+): m/e 557 (M+H)]的产率得到3-{2-[8,9-dioxo-2,6-diazabicyclo[5.2.0]non-1(7)-en-2-yl]ethyl}-1,5-dimethyl-3-oxido-7-oxo-7-phenyl-2,4,6-trioxa-3-phosphahept-1-yl benzoate