Boron tribromide → HCID 67036905, Verbindung
Reaktionsgleichung
C[O:2][C:3]1[CH:4]=[C:5]([C:14]2[C:15]([C:30]([O:32][CH2:33][CH3:34])=[O:31])=[C:16]([C:19]3[C:20]([C:26]([F:29])([F:28])[F:27])=[N+:21]([O-:25])[CH:22]=[CH:23][CH:24]=3)[O:17][CH:18]=2)[CH:6]=[C:7]([N+:11]([O-:13])=[O:12])[C:8]=1[O:9]C.B(Br)(Br)Br>ClCCl>[OH:2][C:3]1[CH:4]=[C:5]([C:14]2[C:15]([C:30]([O:32][CH2:33][CH3:34])=[O:31])=[C:16]([C:19]3[C:20]([C:26]([F:28])([F:29])[F:27])=[N+:21]([O-:25])[CH:22]=[CH:23][CH:24]=3)[O:17][CH:18]=2)[CH:6]=[C:7]([N+:11]([O-:13])=[O:12])[C:8]=1[OH:9]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Reaktionsbedingungen
- Temperatur
- -78 °C
Versuchsvorschrift
3-(4-(3,4-Dimethoxy-5-nitrophenyl)-3-(ethoxycarbonyl)furan-2-yl)-2-(trifluoro-methyl)pyridine-1-oxide (482 mg, 1 mmol) was taken up in dichloromethane (8 mL). The yellowish suspension was cooled to −78° C. under argon and boron tribromide (0.85 mL, 9 mmol) was added dropwise. The reddish reaction mixture was allowed to warm to room temperature and stirred for 18 hours and then carefully poured into ice-water (100 mL) and stirred for 1 hour. The yellow precipitate was filtered off, washed with water and dried over P2O5 under vacuum. Recrystallisation of the solid from ethanol gave 3-(4-(3,4-Dihydroxy-5-nitrophenyl)-3-(ethoxycarbonyl)furan-2-yl)-2-(trifluoromethyl)pyridine 1-oxide as a yellow solid, 0.31 g (68%).
Aufarbeitung
- customThe reddish reaction mixture
- temperatureto warm to room temperature
- stirringstirred for 1 hour
- filtrationThe yellow precipitate was filtered off
- washwashed with water
- dry with materialdried over P2O5 under vacuum
- customRecrystallisation of the solid from ethanol
Quellen und Nachweise
- ORD-Eintrag
- ord-cffdff3b7ee8421a84c1fed69f73de68
- Quelldatensatz
- uspto-grants-2012_05
- Patentnummer
- US08168793B2
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