Methylamine → N-(5-cyano-4-isopropoxypyridin-2-yl)-7-(dimethoxymethyl)-6-((methylamino)methyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxamide

Participants

Reaction Steps

To a suspension of (8-((5-cyano-4-isopropoxypyridin-2-yl)carbamoyl)-2-(dimethoxymethyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-3-yl)methyl methanesulfonate (intermediate 167, 2.59 g, 4.98 mmol) in THF (83 ml) was added methylamine 2 M in THF (37.4 ml, 74.70 mmol) at ambient temperature and the reaction mixture was stirred at room temperature for approximately 4 h. The reaction mixture was diluted with saturated aqueous NaHCO3 and DCM. Phases were separated and the water phase was extracted with DCM (2×), organic phases were combined and dried using Na2SO4, filtered and concentrated to yield the title compound as a light yellow solid. (UPLC-MS 3) tR 0.88 min, ESI-MS 455.3 [M+H]+. 1H NMR (600 MHz, CDCl3) δ 14.00 (s, 1H), 8.37 (s, 1H), 7.95 (s, 1H), 7.61 (s, 1H), 5.51 (s, 1H), 4.88-4.79 (m, 1H), 4.06-4.01 (m, 2H), 3.86 (s, 2H), 3.50 (s, 6H), 2.88-2.80 (m, 2H), 2.49 (s, 3H), 2.03-1.96 (m, 2H), 1.43 (d, 6H).

Provenance & Evidence