methyl (E,2S)-2-[bis[(2-methylpropan-2-yl)oxycarbonyl]amino]-6-fluoro-7-methylsulfonyloxyhept-5-enoate 、 3-methyl-[1,2,4]oxadiazol-5-one potassium salt 以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 2.5h,
以68%的产率得到methyl (E,2S)-2-[bis[(2-methylpropan-2-yl)oxycarbonyl]amino]-6-fluoro-7-(3-methyl-5-oxo-1,2,4-oxadiazol-4-yl)hept-5-enoate