p-Nitrobenzyl (4R,5S,6S)-6-[1'(R)-hydroxyethyl]-4-methyl-3-[(triphenylmethyl)thio]-7-oxo-1-azabicyclo-[3.2.0]hept-2-ene-2-carboxylate 在
吡啶 、
silver nitrate 作用下,
以
甲醇 、
乙腈 为溶剂,
以92%的产率得到p-nitrobenzyl (4R,5S,6S)-6-[1'(R)-hydroxyethyl]-4-methyl-3-silver mercapto-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate