2-Aminopyridine → Methyl 5-(pyridin-2-ylamino)pentanoate

Participants

Reaction Steps

To a solution of methyl 5-oxopentanoate (3.0 g, 23 mmol) in methylene chloride (75 mL) was added 2-aminopyridine (2.38 g, 25.3 mmol). The mixture was stirred at room temperature for 30 minutes. Then, the sodium triacetoxy borohydride (7.31 g, 34.5 mmol) was added and the mixture was stirred at room temperature for 4.5 hours. A saturated solution of sodium bicarbonate (40 mL) was added and the reaction mixture was extracted with ether (4×30 mL). The organic layer was washed with 0.1N NaOH, water (2×40 mL), dried (MgSO4) and concentrated. The residue was purified by flash chromatography 1:1 (Acetone: methylene chloride) to obtain 2.31 g (48%) of the product. 1H NMR (CDCl3) 8.09–8.06 (m, 1H), 7.42–7.38 (m, 1H), 6.59–6.52 (m, 1H), 6.37 (d, J=9 Hz, 1H), 4.52 (br s, 1H), 3.68 (s, 3H), 3.29 (q, J=6 Hz, 2H), 2.40–2.31 (m, 2H), 1.8–1.61 (m, 4H).

Provenance & Evidence