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

Participants

Reaction Steps

To a solution 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, 188 mg, 0.362 mmol) in DCM (1 ml) was added triethylamine (0.176 mL, 1.267 mmol) followed by 1-acetylpiperazine (71.0 mg, 0.543 mmol) and the reaction mixture was stirred at room temperature for approximately 2 h. The reaction mixture was diluted with DCM and water and extracted. The water phase was extracted with DCM (2×), the combined organic layers were dried using Na2SO4, filtered and concentrated. The crude product was purified via silica gel column chromatography, eluting with a gradient of MeOH (1-5%) in DCM. Product fractions were combined and concentrated to yield the title compound as a white solid. (UPLC-MS 3) tR 0.97 min, ESI-MS 552.3 [M+H]+. 1H NMR (600 MHz, CDCl3) δ 14.01 (s, 1H), 8.38 (s, 1H), 7.96 (s, 1H), 7.62 (s, 1H), 5.68 (s, 1H), 4.88-4.80 (m, 1H), 4.07-4.02 (m, 2H), 3.66-3.58 (m, 4H), 3.47-3.42 (m, 8H), 2.86 (t, 2H), 2.45 (t, 2H), 2.41 (t, 2H), 2.09 (s, 3H), 2.04-1.96 (m, 2H), 1.44 (d, 6H).

Provenance & Evidence