Valeryl chloride → N-[2-(2,6-dioxo-3-piperidyl)-1,3-dioxo-isoindolin-4-yl]pentanamide

Participants

Reaction Steps

To a stirred suspension of 4-amino-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione (0.55 g, 2.0 mmol) in THF (30 ml) was added pentanoyl chloride (0.48 g, 4.0 mmol). The stirred mixture was heated to reflux for 18 hours. The solvent was evaporated in vacuo and the resulting solid was slurried in diethyl ether (20 ml) and filtered to give 0.61 g (85%) of product as an off-white solid: mp 178-179° C.; 1H NMR (DMSO-d6) δ 11.17 (s, 1H), 9.65 (s, 1H), 8.50 (d, J=8.3 Hz, 1H), 7.82 (t, J=7.5 Hz, 1H), 7.59 (d, J=7.2 Hz, 1H), 5.18 (dd, J=5.0 and 12.4 Hz, 1H), 2.99-2.89 (m, 1H), 2.68-2.45 (m, 4H), 2.13-2.09 (m, 1H), 1.69-1.57 (m, 2H), 1.44-1.30 (m, 2H), 0.92 (t, J=7.2 Hz, 3H); 13C NMR (DMSO-d6) δ 172.72, 171.99, 169.73, 167.83, 166.64, 136.64, 136.07, 131.36, 125.96, 118.15, 116.68, 48.97, 36.32, 30.97, 26.88, 22.03, 21.70, 13.64; Anal. Calcd. For C18H19N3O5: C, 60.50; H, 5.36; N, 11.76. Found: C, 60.10; H, 5.37; N, 11.58.

Provenance & Evidence