(2S)-5-amino-2-({[5-(diphenylmethyl)thiophen-2-yl]carbonyl}amino)pentanoic acid trifluoroacetate 、
甲醇 、
ethyl N-hydroxyacetimidate 以
三乙胺 为溶剂,
反应 73.5h,
以at room temperature for three days to give (2S)-2-({[5-(diphenylmethyl)thiophen-2-yl]carbonyl}amino)-5-{[1-(hydroxyamino)ethylidene]amino}pentanoic acid•TFA (136, 14 mg) as a white powder的产率得到(E)-(2S)-2-({[5-(diphenylmethyl)thiophen-2-yl]carbonyl}amino)-5-{[1-(hydroxyamino)ethylidene]amino }pentanoic acid trifluoroacetate