Trifluoroacetic acid → 3-(5-amino-2,4-difluorophenyl)-1-methyl-7-(methylamino)-1,6-naphthyridin-2(1H)-one

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A solution of 7-((4-methoxybenzyl)(methyl)amino)-3-(5-amino-2,4-difluorophenyl)-1-methyl-1,6-naphthyridin-2(1H)-one (3 g, 6.8 mmol) in DCM (100 mL) was treated with TFA (20 mL) and stirred at RT for 6 h. The mixture was extracted with water and the combined aqueous layers were neutralized with NH3H2O. The precipitate was collected by filtration and dried to give 3-(5-amino-2,4-difluorophenyl)-1-methyl-7-(methylamino)-1,6-naphthyridin-2(1H)-one (661 mg, 30% yield). 1H NMR (300 MHz, DMSO-d6): δ 8.39 (s, 1H), 7.78 (s, 1H), 7.08-6.93 (m, 2H), 6.80 (dd, J=10.2, 8.1 Hz, 1H), 6.16 (s, 1H), 5.00 (s, 2H), 3.50 (s, 3H), 2.84 (d, J=4.8 Hz, 3H); MS (ESI) m/z: 317.0 [M+H]+.

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