Benzimidazole → 3-(1-benzimidazolyl)-4-(3-indolyl)-1H-pyrrole-2,5-dione
Reaktionsgleichung
[H-].[Na+].[N:3]1[C:7]2[CH:8]=[CH:9][CH:10]=[CH:11][C:6]=2[NH:5][CH:4]=1.Br[C:13]1[C:14](=[O:28])[NH:15][C:16](=[O:27])[C:17]=1[C:18]1[C:26]2[C:21](=[CH:22][CH:23]=[CH:24][CH:25]=2)[NH:20][CH:19]=1>CN(C=O)C>[N:3]1([C:13]2[C:14](=[O:28])[NH:15][C:16](=[O:27])[C:17]=2[C:18]2[C:26]3[C:21](=[CH:22][CH:23]=[CH:24][CH:25]=3)[NH:20][CH:19]=2)[C:7]2[CH:8]=[CH:9][CH:10]=[CH:11][C:6]=2[N:5]=[CH:4]1Komponenten
Reaktionsbedingungen
- Temperatur
- 50 °C
Versuchsvorschrift
260 mg of a 60% dispersion of sodium hydride in mineral oil were added to a solution of 295 mg of benzimidazole in 10 ml of DMF and the mixture was stirred under nitrogen for 0.5 hour. 582 mg of 3-bromo-4-(3-indolyl)-1H-pyrrole-2,5-dione were added and the mixture was heated to 50° C. for 18 hours. A solution of 767 mg of benzimidazole and 260 mg of sodium hydride in 10 ml of DMF was added and the mixture was heated to 90° C. for 18 hours under nitrogen. The solvent was evaporated and the residue was partitioned between dichloromethane and 2M hydrochloric acid. The precipitate was purified on silica gel with ethyl acetate/petroleum ether. Recrystallization from ethyl acetate gave 25 mg of 3-(1-benzimidazolyl)-4-(3-indolyl)-1H-pyrrole-2,5-dione, m.p. 310°-320° C.
Aufarbeitung
- temperaturethe mixture was heated to 90° C. for 18 hours under nitrogen
- customThe solvent was evaporated
- customthe residue was partitioned between dichloromethane and 2M hydrochloric acid
- customThe precipitate was purified on silica gel with ethyl acetate/petroleum ether
- customRecrystallization from ethyl acetate
Quellen und Nachweise
- ORD-Eintrag
- ord-90f9ef5d95f24c1fb7fe41ec24ac8214
- Quelldatensatz
- uspto-grants-2000_06
- Patentnummer
- USRE036736
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