tert-butyl (1R,3S,4S)-3-[[(1S)-1-cyano-2-[2-fluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]ethyl]carbamoyl]-2-azabicyclo[2.2.1]heptane-2-carboxylate 、 5-bromo-1'-(oxetan-3-yl)spiro[1H-isobenzofuran-3,4'-piperidine] 在
dichloro[1,1'-bis(di-t-butylphosphino)ferrocene]palladium(II) 、 sodium carbonate 作用下,
以
水 、
丙酮 为溶剂,
反应 1.5h,
以75%的产率得到tert-butyl (1R,3S,4S)-3-[[(1S)-1-cyano-2-[2-fluoro-4-[1'-(oxetan-3-yl)spiro[1H-2-benzofuran-3,4'-piperidine]-5-yl]phenyl]ethyl]carbamoyl]-2-azabicyclo[2.2.1]heptane-2-carboxylate