[F:1][C:2]([F:38])([F:37])[C:3]1[CH:4]=[C:5]([CH:30]=[C:31]([C:33]([F:36])([F:35])[F:34])[CH:32]=1)[CH2:6][N:7]([CH3:29])[C:8]([C:10]1[N:19]([CH3:20])[C:18](=[O:21])[C:13]2=[N:14][CH:15]=[CH:16][CH:17]=[C:12]2[C:11]=1[C:22]1[CH:27]=[CH:26][C:25]([F:28])=[CH:24][CH:23]=1)=[O:9].[I:39][CH3:40]>O1CCOCC1>[I-:39].[F:38][C:2]([F:1])([F:37])[C:3]1[CH:4]=[C:5]([CH:30]=[C:31]([C:33]([F:34])([F:36])[F:35])[CH:32]=1)[CH2:6][N:7]([CH3:29])[C:8]([C:10]1[N:19]([CH3:20])[C:18](=[O:21])[C:13]2=[N+:14]([CH3:40])[CH:15]=[CH:16][CH:17]=[C:12]2[C:11]=1[C:22]1[CH:23]=[CH:24][C:25]([F:28])=[CH:26][CH:27]=1)=[O:9]A mixture of N-[3,5-bis(trifluoromethyl)benzyl]-5-(4-fluorophenyl)-7,8-dihydro-N, 7-dimethyl-8-oxo-6pyrido[3,4-b]pyridinecarboxamide (Example 1) (175 mg), iodomethane (3 ml) and dioxane (3 ml) was heated for 16 hours under reflux. The solvent was distilled off to leave the above-titled compound as yellow crystals (200 mg), m.p.184°-185° C. (decomp.) (recrystallized from dioxane-ethyl acetate).
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