Dimethylformamide → N-(5-cyanopyridin-2-yl)-7-(dimethoxymethyl)-6-formyl-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxamide

Participants

Reaction Steps

To a solution of 6-bromo-N-(5-cyanopyridin-2-yl)-7-(dimethoxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxamide (intermediate 2H, 300 mg, 0.694 mmol) in THF (10 ml) at −78° C., was added MeLi (1.6 M in Et2O, 0.434 ml, 0.694 mmol), the solution was stirred for 5 min, then n-BuLi in (1.6 M in hexane, 0.477 ml, 0.763 mmol) was added and the solution was stirred for 20 min. Then, DMF (0.322 ml, 4.16 mmol) was added, the reaction mixture was stirred at −78° C. for 1 h and then allowed to warm to room temperature. The reaction mixture was poured into sat. aq. NH4Cl and extracted twice with DCM. The combined organic phase was then dried over Na2SO4, filtered and evaporated. The crude material was purified by normal phase chromatography (40 g gold silica gel cartridge, heptanes/EtOAc 95:5 to 0:100) to give the title compound as a colorless powder. (UPLC-MS 3) tR 1.10 min; ESI-MS 382.2 [M+H]+.

Provenance & Evidence