3-[2-(1-tert-Butoxycarbonyl-piperidin-4-yl)-ethyl]-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridine-8-carboxylic acid 在
lithium hydroxide 、
1-羟基苯并三唑 、 O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 作用下,
以
四氢呋喃 、
乙腈 为溶剂,
生成 4-{2-[8-((S)-2-Carboxy-1-pyridin-3-yl-ethylcarbamoyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridin-3-yl]-ethyl}-piperidine-1-carboxylic acid tert-butyl ester