(2S)-5-amino-2-({[5-(diphenylmethyl)thiophen-2-yl]carbonyl}amino)pentanoic acid trifluoroacetate 、
乙醇 、
Ethyl picolinimidate hydrochloride 以
三乙胺 为溶剂,
反应 16.0h,
以to give (2S)-2-({[5-(diphenylmethyl)thiophen-2-yl]carbonyl}amino)-5-{[imino(pyridin-2-yl)methyl]amino}pentanoic acid•TFA (119, 85 mg) as an off-white solid的产率得到(2S)-2-({[5-(diphenylmethyl)thiophen-2-yl]carbonyl}amino)-5-{[imino(pyridin-2-yl)methyl]amino}pentanoic acid trifluoroacetate