(4R,5S,6S)-(p-nitrobenzyl) 3-[[(3S,5S)-1-(p-nitrobenzyloxycarbonyl)-5-carboxy-3-pyrrolidinyl]thio]-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate 在
lithium 2-ethylhexanoate 作用下,
以
乙酸乙酯 为溶剂,
反应 15.5h,
生成 (4R,5S,6S)-(p-nitrobenzyl) 3-[[(3S,5S)-1-(-p-nitrobenzyloxycarbonyl)-5-(lithium carboxylato)-3-pyrrolidinyl]thio]-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate