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A solution of 6-amino-4-((2-methoxyethyl)amino)nicotinonitrile (intermediate 75, 481 mg, 2.50 mmol) in anhydrous DMF (1.5 ml) was added drop wise over 10 minutes to a mixture of di(1H-1,2,4-triazol-1-yl)methanone (410 mg, 2.50 mmol) and DMF (1.5 ml) cooled at 0° C. After stirring for 45 minutes at 0° C. the reaction mixture was allowed to warm to room temperature and after a further 90 minutes at room temperature a solution of 1-((2-(dimethoxymethyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)methyl)-4-methylpiperazin-2-one (intermediate 81, 418 mg, 1.00 mmol) in DMF (2 ml) was added. The reaction mixture was stirred for 17.5 h at room temperature, quenched by the addition of MeOH and evaporated. The residue was applied to a 80 g RediSep® silica column as a DCM solution and purified by normal phase chromatography, eluting with a gradient from DCM to 2% MeOH in DCM. Product containing fractions were combined and evaporated to give the title compound as an orange foam. 1H NMR (400 MHz, DMSO-d6) δ 13.50 (s, 1H), 8.27 (s, 1H), 7.52 (s, 1H), 7.39 (s, 1H), 6.93 (t, 1H), 5.45 (s, 1H), 4.65 (s, 2H), 3.94-3.89 (m, 2H), 3.54-3.50 (m, 2H), 3.40-3.35 (m, 2H), 3.38 (s, 6H), 3.29 (s, 3H), 3.20-3.16 (m, 2H), 3.05 (s, 2H), 2.86-2.80 (m, 2H), 2.61-2.55 (m, 2H), 2.22 (s, 3H), 1.94-1.88 (m, 2H). (UPLC-MS 6) tR 0.72; ESI-MS 553.3 [M+H]+.

1. additionwas added
2. stirringThe reaction mixture was stirred for 17.5 h at room temperature
3. customquenched by the addition of MeOH
4. customevaporated
5. custompurified by normal phase chromatography
6. washeluting with a gradient from DCM to 2% MeOH in DCM
7. additionProduct containing fractions
8. customevaporated