(S)-3-Amino-2-(2-pyridin-3-yl-acetylamino)-propionic acid methyl ester 、 3-[(E)-2-[1-[(2-methylpropan-2-yl)oxycarbonyl]piperidin-4-yl]ethenyl]-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridine-8-carboxylic acid 在
1-羟基苯并三唑 、 O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 作用下,
以
乙腈 为溶剂,
生成 4-((E)-2-{8-[(S)-2-Methoxycarbonyl-2-(2-pyridin-3-yl-acetylamino)-ethylcarbamoyl]-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridin-3-yl}-vinyl)-piperidine-1-carboxylic acid tert-butyl ester