Acetic Anhydride → 1-[2-(Acetylamino)ethyl]-7-[(4-fluorophenyl)methyl]-4-hydroxy-N-{2-[(1-methylethyl)oxy]ethyl}-2-oxo-1,2-dihydro-1,5-naphthyridine-3-carboxamide

Participants

Reaction Steps

A solution of 1-(2-aminoethyl)-7-[(4-fluorophenyl)methyl]-4-hydroxy-N-{2-[(1-methylethyl)oxy]ethyl}-2-oxo-1,2-dihydro-1,5-naphthyridine-3-carboxamide (0.021 g, 0.046 mmol) and diisopropyl ethylamine (0.04 mL, 0.23 mmol) in DMF (5 mL) under nitrogen was treated with acetic anhydride (0.0046 mL, 0.048 mmol) at ambient temperature. The reaction was concentrated in vacuo and the resulting residue was treated with 1 N NaHSO4. Extracted the mixture twice with EtOAc, combined the organics, dried over MgSO4, filtered and concentrated the filtrate. The residue was then triturated with Et2O, filtered, and dried in vacuo to provide the title compound as an off-white solid: 1H NMR (300 MHz, DMSO-D6) δ ppm 1.1 (d, J=6.0 Hz, 6 H), 1.7 (s, 3 H), 3.3 (q, J=6.1, 2 H), 3.5 (m, 3 H), 3.6 (m, 2 H), 4.1 (s, 2 H), 4.3 (t, J=6.5 Hz, 2 H), 7.1 (m, 2 H), 7.4 (ddd, J=12.1, 5.5, 3.2 Hz, 2 H), 8.0 (d, J=6.0 Hz, 1 H), 8.2 (d, J=1.3 Hz, 1 H), 8.5 (d, J=1.5 Hz, 1 H), 10.4 (t, J=5.1 Hz, 1 H), 17.1 (s, 1 H); ES+ MS: 485 (M+H+).

Provenance & Evidence