Methyl 2-aminopyridine-4-carboxylate → 1-(2-Aminopyridin-4-yl)ethan-1-one

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of methyl-2-aminopyridine-4-carboxylate (35) (1.00 g, 6.57 mmol) in THF (100 mL), at −78° C. under nitrogen, was added methyllithium (1.6 M in diethyl ether, 16.4 mL, 26.3 mmol), over 10 min. After a further 30 min at −78° C., the viscous reaction mixture was warmed to 0° C. After a further 3 hr, the reaction was quenched at 0° C. by the cautious addition of iso-propanol (8.0 mL). The mixture was warmed to RT, brine (200 mL) and EtOAc (150 mL) were added, and the layers were separated. The aqueous layer was extracted with EtOAc (3×100 mL), and the combined organic extracts were dried and the solvents removed in vacuo. The crude residue was purified by column chromatography (SiO2, 80 g, 0-8% MeOH in EtOAc, gradient elution) to give the title compound (36) (176 mg, 20%) as a yellow powder: m/z 137 (M+H)+ (ES+).

Provenance & Evidence