(1S,3R)-3-[(tert-butoxycarbonyl)amino]-1-ethylcyclopentanecarboxylic acid 、 1-[4-(trifluoromethyl)pyridin-2-yl]piperazine dihydrochloride 在
O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 、
三乙胺 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
以72.9%的产率得到tert-butyl [(1R,3S)-3-ethyl-3-(4-[4-(trifluoromethyl)pyridin-2-yl]piperazin-1-ylcarbonyl)cyclopentyl]carbamate