[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[C:12]3([CH2:17][CH2:16][N:15]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH2:14][CH2:13]3)[C:11](=[O:23])[NH:10][CH2:9]2)=[CH:4][CH:3]=1.[CH3:24]S(C)=O.[H-].[Na+].IC>C1C=CC=CC=1>[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[C:12]3([CH2:17][CH2:16][N:15]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH2:14][CH2:13]3)[C:11](=[O:23])[N:10]([CH3:24])[CH2:9]2)=[CH:4][CH:3]=1To a stirred and cooled (below 5° C.) mixture of 16 parts of ethyl 1-(4-fluorophenyl)-4-oxo-1,3,8-triazaspiro[4,5]decane-8-carboxylate, 200 parts of dimethyl sulfoxide and 200 parts of benzene are added 3.5 parts of a sodium hydride dispersion 50%. After stirring for 1 hour at a temperature below 5° C., there are added dropwise 10 parts of iodomethane at this temperature. Upon completion, stirring is continued overnight at room temperature. The reaction mixture is poured onto water and the layers are separated. The aqueous phase is extracted with methylbenzene. The extract is washed with water, dried, filtered and evaporated, yielding 14.7 parts (88%) of ethyl 1-(4-fluorophenyl)-3-methyl-4-oxo-1,3,8-triazaspiro[4,5]decane-8-carboxylate as a residue.
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