1-{[(4-nitrophenoxy)carbonyl]oxy}ethyl acetate 在
potassium carbonate 作用下,
以
1,4-二氧六环 、
乙腈 为溶剂,
生成 (4R,5S,6S)-3-{(2R,3R)-2-[(1-Acetoxy-ethoxycarbonylamino)-methyl]-tetrahydro-furan-3-ylsulfanyl}-6-((R)-1-hydroxy-ethyl)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid ethoxycarbonyloxymethyl ester