Acetamidomalonic acid diethyl ester → HCID 86637846, compound

Participants

Reaction Steps

To a solution of 0.598 g (0.026 mol) sodium metal in 25 ml absolute EtOH, 5.65 g diethyl acetamidomalonate (0.026 mol) was added, following previously published procedures (Chenault, H. K. et al., 1989). The mixture was stirred for 30 min at room temperature. By dropwise addition, azidobutylbromide 1a (4.82 g, 0.027 mol) was added with stirring. The reaction mixture was stirred for 2 h at room temperature and refluxed for 6 h at 80° C. After cooling overnight, the reaction mixture was concentrated to dryness, and the residue was extracted with diethyl ether. The combined ether extracts were washed with water, sat. NaHCO3, water, and brine, and were dried over MgSO4 and then concentrated. Silica gel chromatography (Hex:EtOAc=1:1) gave a product (63%) as a clear, viscous oil. 1H NMR (300 MHz, CDCl3): δ 6.77 (1H, s), 4.24 (4H, q, J=6.9 Hz), 3.26 (2H, t, J=6.9 Hz), 2.31-2.37 (2H, m), 2.04 (3H, s), 1.59 (2H, p, J=7.5 Hz), 1.26 (6H, t, J=6 Hz), 1.16-1.27 (2H, m). ESI-MS m/e 315.

Provenance & Evidence