1,8-Diazabicyclo(5.4.0)undec-7-ene → N-{[2-(2,6-dioxo(3-piperidyl))-1,3-dioxoisoindolin-4-yl]methyl}(cyclopentylamino)carboxamide

Participants

Reaction Steps

1,8-Diazabicyclo[5,4,0]undec-7-ene (0.29 g, 1.9 mmol) was added to a stirred suspension of 4-(aminomethyl)-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione hydrochloride (0.6 g, 1.85 mmol) in acetonitrile (50 mL). After stirring for 20 min, 4-nitrophenyl-N-cyclopentylcarbamate (0.44 g, 1.85 mmol) was added. The mixture was stirred at room temperature for 17 hours. The mixture was filtered to afford N-{[2-(2,6-dioxo(3-piperidyl))-1,3-dioxoisoindolin-4-yl]methyl}(cyclopentylamino)carboxamide (0.2 g, 27%) as a white solid: mp 151-153° C.; 1H NMR (DMSO-d6) δ 11.13 (s, 1H), 7.86-7.68 (m, 3H), 6.31 (t, 1H), 6.17 (d, J=6.9 Hz, 1H), 5.18-5.11 (dd, J=4.6 and 12.3 Hz, 1H), 4.62 (d, J=5.4 Hz, 2H), 3.83 (q, J=6.4 Hz, 2H), 2.96-2.85 (m, 1H), 2.64-2.50 (m, 2H), 2.07-2.04 (m, 1H), 1.70-1.29 (m, 8H); 13C NMR (DMSO-d6) δ 172.77, 169.83, 167.59, 167.04, 157.63, 141.12, 134.64, 133.43, 131.52, 128.99, 121.64, 51.09, 48.83, 38.70, 32.91, 30.94, 23.16, 21.99; Anal. Calcd. For C20H22N4O5: C, 60.29; H, 5.57; N, 14.06. Found: C, 60.09; H, 5.66; N; 14.15.

Provenance & Evidence