(1S,3S,4S)-N-[(1S)-1-cyano-2-[(3S)-2-oxo-3-piperidyl]ethyl]-5,5-difluoro-2-azabicyclo[2.2.2]octane-3-carboxamide 4-methylbenzenesulfonate 、
(2R)-2-(3-chloroanilino)-4-methylpentanoic acid 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
N,N-二甲基甲酰胺 为溶剂,
以21 %的产率得到(1S,3S,4S)-2-[(2R)-2-(3-chloroanilino)-4-methyl-pentanoyl]-N-[(1S)-1-cyano-2-[(3S)-2-oxo-3-piperidyl]ethyl]-5,5-difluoro-2-azabicyclo[2.2.2]octane-3-carboxamide