Sodium hydride → Methyl 2-[(5-bromopyridin-2-yl)[(tert-butoxy)carbonyl]amino]acetate

Participants

Reaction Steps

To a solution of 5-bromo-2-(tert-butoxycarbonyl)aminopyridine (25.0 g, 91.5 mmole) in DMF (400 mL) was added portionwise with stirring a 60% dispersion of NaH in mineral oil (4.0 g, 100 mmole). The reaction was stirred for 15 min, then methyl bromoacetate (15 mL, 158.5 mmole) was added dropwise over 15 min. After stirring for 18 h at room temperature the reaction was concentrated to dryness. The remaining residue was taken up in EtOAc (200 mL) and H2O (200 mL) and filtered to remove insoluble material. The EtOAc phase was separated, washed with brine, dried (Na2SO4) and concentrated to dryness. Purification by flash chromatography on silica gel (10% EtOAc/Hexane) gave the title compound (16.56 g, 50%): 1H NMR (400 MHz, CDCl3) δ 8.33 (s, 1H), 7.73 (d, J=2.5 Hz, 1H), 7.71 (d, J=2.5 Hz, 1H), 4.69 (s, 2H), 3.75 (s, 3H), 1.51 (s, 9H).

Provenance & Evidence