上游原料
4-nitrobenzyl (5R,6S)-6-[(1R)-1-hydroxyethyl]-3,7-dioxo-1-azabicyclo[3.2.0]heptane-2-carboxylate6-bromo-2-methyl-9H-fluoren-9-one6-bromo-2-(bromomethyl)-9H-fluoren-9-one(6-bromo-9-oxo-9H-fluoren-2-yl)methyl acetate6-bromo-2-(hydroxymethyl)-9H-fluoren-9-one2-(hydroxymethyl)-6-(trimethylstannyl)-9H-fluoren-9-one4-nitrobenzyl (5R,6S)-7-oxo-6-[(1R)-1-[(triethylsilyl)oxy]ethyl]-3-[[(trifluoromethyl)sulfonyl]oxy]-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate4-nitrobenzyl (5R,6S)-3-[7-(hydroxymethyl)-9-oxo-9H-fluoren-3-yl]-7-oxo-6-[(1R)-1-[(triethylsilyl)oxy]ethyl]-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate1-methyl-1H-imidazole1-methyl-3-[[6-((5R,6S)-2-[[(4-nitrobenzyl)oxy]carbonyl]-7-oxo-6-[(1R)-1-[(triethylsilyl)oxy]ethyl]-1-azabicyclo[3.2.0]hept-2-en-3-yl)-9-oxo-9H-fluoren-2-yl]methyl]-1H-imidazol-3-ium chloride3-[[6-((5R,6S)-6-[(1R)-1-hydroxyethyl]-2-[[(4-nitrobenzyl)oxy]carbonyl]-7-oxo-1-azabicyclo[3.2.0]hept-2-en-3-yl)-9-oxo-9H-fluoren-2-yl]methyl]-1-methyl-1H-imidazol-3-ium chloride
