[C:1]([C:3]1[CH:4]=[CH:5][C:6]([NH:9][C:10]([N:12]2[C:21]3[C:16](=[CH:17][C:18]([CH:27]([F:29])[F:28])=[C:19]([CH:22](OC)[O:23]C)[N:20]=3)[CH2:15][CH2:14][CH2:13]2)=[O:11])=[N:7][CH:8]=1)#[N:2].Cl.C([O-])(O)=O.[Na+]>C1COCC1.O>[C:1]([C:3]1[CH:4]=[CH:5][C:6]([NH:9][C:10]([N:12]2[C:21]3[C:16](=[CH:17][C:18]([CH:27]([F:28])[F:29])=[C:19]([CH:22]=[O:23])[N:20]=3)[CH2:15][CH2:14][CH2:13]2)=[O:11])=[N:7][CH:8]=1)#[N:2]To a solution of N-(5-cyanopyridin-2-yl)-6-(difluoromethyl)-7-(dimethoxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxamide (intermediate 35, 11 mg, 0.027 mmol) in THF (0.5 ml) and H2O (0.1 ml) was added conc. HCl (0.017 ml), the reaction mixture was stirred at room temperature for 8 h, then conc. HCl (0.033 ml) was added and the reaction mixture was stirred for 20 h. The reaction mixture was poured into sat. aq. NaHCO3 and extracted with DCM (3×). The organic phase was then dried over Na2SO4, filtered and evaporated to give the title compound as a colorless solid.
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