[CH3:1][N:2]([CH3:42])[CH2:3][CH2:4][N:5]1[C:14]2[C:9](=[CH:10][C:11]([C:15]3[CH:16]=[N:17][C:18]([NH:30][C:31](=[O:35])[NH:32][CH2:33][CH3:34])=[CH:19][C:20]=3[C:21]3[S:22][CH:23]=[C:24]([C:26]([F:29])([F:28])[F:27])[N:25]=3)=[CH:12][N:13]=2)[C:8](=[O:36])[C:7]([C:37]([O:39]CC)=[O:38])=[CH:6]1>C(O)C>[CH3:42][N:2]([CH3:1])[CH2:3][CH2:4][N:5]1[C:14]2[C:9](=[CH:10][C:11]([C:15]3[CH:16]=[N:17][C:18]([NH:30][C:31](=[O:35])[NH:32][CH2:33][CH3:34])=[CH:19][C:20]=3[C:21]3[S:22][CH:23]=[C:24]([C:26]([F:29])([F:28])[F:27])[N:25]=3)=[CH:12][N:13]=2)[C:8](=[O:36])[C:7]([C:37]([OH:39])=[O:38])=[CH:6]1To a stirred suspension of ethyl 1-[2-(dimethylamino)ethyl]-6-{6-[(ethylcarbamoyl)amino]-4-[4-(trifluoromethyl)-1,3-thiazol-2-yl]pyridin-3-yl}-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylate (Example 15, 100 mg, 0.16 mmol) in ethanol (10 mL) 10% potassium hydroxide (0.3 mL) was added. The reaction mixture was heated to 90° C. for 1 h. After completion of the reaction, the reaction mixture was cooled to room temperature then concentrated under reduced pressure to a residue. The residue was diluted with water and acidified with 2N HCl to pH 2-3 to obtain a solid which was filtered, washed with water and dried to afford 50 mg of crude product. This was purified by preparative HPLC to give 15 mg (15%) of 1-[2-(dimethylamino)ethyl]-6-{6-[(ethylcarbamoyl)amino]-4-[4-(trifluoromethyl)-1,3-thiazol-2-yl]pyridin-3-yl}-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid.
読み込み中…