(2,5-cis)-4,4-difluoro-5-methyl-pyrrolidine-2-carboxylic acid methyl ester hydrochloride 、
BOC-L-亮氨酸 在
N,N-二异丙基乙胺 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 2.02h,
生成 1-((S)-2-tert-butoxycarbonylamino-4-methyl-pentanoyl)-(2,5-cis)-4,4-difluoro-5-methyl-pyrrolidine-2-carboxylic acid methyl ester