Reaktion #10066

Reaktionsgleichung

1,8-Diazabicyclo[5,4,0]undec-7-ene

4-(aminomethyl)-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione

6-(chloroformyl)hexanoic acid ethyl ester

→

ethyl 6-(N-{[2-(2,6-dioxo(3-piperidyl))-1,3-dioxoisoindolin-4-yl]methyl}carbamoyl)hexanoate

Ausbeute 50.0%

Lösungsmittel

CH3CN

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGThe mixture was stirred at room temperature for 17 hours
2. 2
   SonstigeThe solvent was removed in vacuo
3. 3
   workup.DISSOLUTIONthe residue was dissolved in CH2Cl2 (70 ml)
4. 4
   WaschenThe CH2Cl2 solution was washed with 1N HCl (30 ml), H2O (30 ml), brine (30 ml)
5. 5
   Trocknendried (MgSO4)
6. 6
   SonstigeThe solvent was removed in vacuo
7. 7
   Sonstigethe residue was purified by chromatography (SiO2, CH2Cl2:EtOAc 1:1)

Vorschrift

1,8-Diazabicyclo[5,4,0]undec-7-ene (0.65 g, 4.26 mmol) was added to a stirred suspension of 4-(aminomethyl)-2-(2,6-dioxo(3-piperidyl))isoindoline-1,3-dione hydrocbloride (0.6 g, 1.85 mmol) in CH3CN (50 ml). After stirring for 20 min, 6-(chloroformyl)hexanoic acid ethyl ester (0.46 g, 2.22 mmol) was added. The mixture was stirred at room temperature for 17 hours. The solvent was removed in vacuo and the residue was dissolved in CH2Cl2 (70 ml). The CH2Cl2 solution was washed with 1N HCl (30 ml), H2O (30 ml), brine (30 ml) and dried (MgSO4). The solvent was removed in vacuo and the residue was purified by chromatography (SiO2, CH2Cl2:EtOAc 1:1) to give ethyl 6-(N-{[2-(2,6-dioxo(3-piperidyl))-1,3-dioxoisoindolin-4-yl]methyl}carbamoyl)hexanoate (0.43 g, 50%) as a white solid: mp 82–84° C.; 1H NMR (DMSO-d6) δ d 11.11 (s, 1H), 8.41 (t, J=5.6 Hz, 1H), 7.86–7.65 (m, 3H), 5.18–5.11 (dd, J=5.4 and 12.4 Hz, 1H), 4.72 (d, J=5.7 Hz, 2H), 4.05 (q, J=7.1 Ha, 2H), 2.97–2.83 (m, 1H), 2.64–2.48 (m, 2H), 2.30–2.15 (m, 4H), 2.08–2.04 (m, 1H), 1.56–1.47 (m, 4H), 1.32–1.23 (m, 2H), 1.17 (t, J=7.1 Hz, 3H), 13C NMR (DMSO-d6) δ d 172.80, 172.71, 172.52, 169.77, 167.45, 166.92, 139.49, 134.67, 133.13, 131.49, 127.04, 121.78, 59.60, 48.84, 37.57, 35.02, 33.38, 30.91, 28.08, 24.83, 24.16, 21.96, 14.09; Anal. Calcd. For C23H27N3O7: C, 60.39; H, 5.95; N, 9.18. Found: C, 60.10; H, 5.82; N, 8.82.

Quelle