(1R,2S,5S)-methyl 3-((S)-2-amino-3,3-dimethylbutanoyl)-6,6-dimethyl-3-azabicyclo[3.1.0]hexane-2-carboxylate hydrochloride 、
(2S)-2-cyclohexyl-2-(pyridine-2-carbonylamino)acetic acid 在
N-甲基吗啉 、 Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
DMF (N,N-dimethyl-formamide) 、
二氯甲烷 为溶剂,
以93%的产率得到methyl (1R,2S,5S)-3-[(2S)-2-[[(2S)-2-cyclohexyl-2-(pyridine-2-carbonylamino)acetyl]amino]-3,3-dimethylbutanoyl]-6,6-dimethyl-3-azabicyclo[3.1.0]hexane-2-carboxylate