[F:1][C:2]1[C:3]([CH3:27])=[C:4]([C:8]2[CH:17]=[C:16]3[C:11]([CH:12]=[C:13]([NH:18]C(=O)OC(C)(C)C)[N:14]=[CH:15]3)=[C:10]([CH3:26])[N:9]=2)[CH:5]=[N:6][CH:7]=1.FC(F)(F)C(O)=O>ClCCCl>[F:1][C:2]1[C:3]([CH3:27])=[C:4]([C:8]2[CH:17]=[C:16]3[C:11]([CH:12]=[C:13]([NH2:18])[N:14]=[CH:15]3)=[C:10]([CH3:26])[N:9]=2)[CH:5]=[N:6][CH:7]=1A suspension of tert-butyl 7-(5-fluoro-4-methylpyridin-3-yl)-5-methyl-2,6-naphthyridin-3-ylcarbamate (110 mg, 0.30 mmol) in 1,2-dichloroethane (2 mL) was treated with trifluoroacetic acid (0.23 mL, 3.0 mmol), and the mixture was stirred at 40° C. for 2 hours. The mixture was concentrated in vacuo and then diluted with dichloromethane (50 mL) and washed with saturated aqueous sodium bicarbonate solution (10 mL). The organic layer was separated, dried over sodium sulfate, filtered, and evaporated in vacuo to afford the title compound as a bright yellow solid (80 mg, 99%), which was used in the next step without further purification.
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