Ammonium Chloride → N-(5-cyano-4-(2-methoxyethoxy)pyridin-2-yl)-6-cyclopropyl-7-formyl-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxamide

Participants

Reaction Conditions

Reaction Steps

To a solution of phenyl 6-cyclopropyl-7-(dimethoxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxylate (intermediate 51A, 52 mg, 0.141 mmol) and 6-amino-4-(2-methoxyethoxy)nicotinonitrile (intermediate 20, 30.0 mg, 0.155 mmol) in THF (1 ml) at −78° C. was slowly added LHMDS (1 M in THF, 0.311 ml, 0.311 mmol). The reaction mixture was stirred at −78° C. for 30 min and then allowed to warm to room temperature. The reaction mixture was poured into sat. aq. NH4Cl and extracted twice with DCM. The organic phase was then dried over Na2SO4, filtered and concentrated. The residue was subjected to reverse phase chromatography (13 g C18 cartridge, 0.1% TFA in water/acetonitrile 90:10 to 0:100) to give a mixture of title compound and N-(5-cyano-4-(2-methoxyethoxyl)pyridin-2-yl)-6-cyclopropyl-7-(dimethoxymethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxamide as an off-white powder. This material was dissolved in THF (2 ml) and H2O (2 ml), treated with conc. HCl (1.0 ml), the reaction mixture was stirred at room temperature for 1 h. The reaction mixture was poured into sat. aq. NaHCO3 and extracted with DCM (2×). The organic phase was then dried over Na2SO4, filtered and concentrated to give the title compound as a light brown powder.

Provenance & Evidence