1,3-diethyl-bicyclo[3.2.1]-1β,3,8-triaza-spiro[4.5]dodecan-2,4-dione 、
methanesulfonic acid (3R,4S)-1-(4,4-difluoro-cyclohexanecarbonyl)-4-phenyl-pyrrolidin-3-ylmethyl ester 在
碳酸氢钠 、 potassium iodide 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以16%的产率得到(3S,4S)-1-(4,4-difluoro-cyclohexanecarbonyl)-3-[1,3-diethyl-bicyclo[3.2.1]-2,4-dioxo-1β,3,8-triaza-spiro[4.5]dodec-8-ylmethyl]-4-phenyl-pyrrolidine hydrochloride