Methanol → N-[2-(2,6-dioxo-3-piperidyl)-1,3-dioxo-isoindolin-4-yl]butanamide

Participants

Reaction Steps

To a suspension of 4-amino-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione (0.55 g, 2 mmol) in THF (30 ml) was added butanoyl chloride (0.42 ml, 4 mmol). The mixture was heated to reflux for 18 hours. The reaction was cooled to room temperature, methanol (2 ml) was added, and the mixture stirred for 1 hour. The solvent was evaporated in vacuo leaving a solid that was slurried in diethyl ether (20 ml) and filtered to give 0.55 g (80%) of product as an off-white solid: mp 171-173° C.; 1H NMR (DMSO-d6) d 11.14 (s, 1H), 9.68 (s, 1H), 8.48 (d, J=8.3 Hz, 1H), 7.83 (t, J=7.5 Hz, 1H), 7.61 (d, J=7.2 Hz, 1H), 5.15 (dd, J=5.2 and 12.6 Hz, 1H), 2.96-2.84 (m, 1H), 2.65-2.42 (m, 4H), 2.11-2.06 (m, 1H), 1.73-1.58 (m, 2H), 0.95 (t, J=7.4 Hz, 3H); 13C NMR (DMSO-d6) d 172.70, 171.84, 169.72, 167.70, 166.63, 136.54, 136.07, 131.41, 126.17, 118.23, 116.89, 48.90, 30.91, 21.96, 18.25, 13.46; Anal. Calcd. For C17H17N3O5: C, 59.47; H, 4.99; N, 12.24. Found: C, 59.45; H, 4.82; N, 12.15.

Provenance & Evidence