Reaktionsgleichung
[C:1]([O:5][C:6]1[C:11]([F:12])=[C:10]([F:13])[N:9]=[C:8]([F:14])[C:7]=1Cl)([CH3:4])([CH3:3])[CH3:2].[H][H]>CO.[OH-].[OH-].[Pd+2]>[C:1]([O:5][C:6]1[CH:7]=[C:8]([F:14])[N:9]=[C:10]([F:13])[C:11]=1[F:12])([CH3:4])([CH3:2])[CH3:3]Komponenten
Versuchsvorschrift
To 4-t-butoxy-3-chloro-2,5,6-trifluoropyridine (24.92 g, 0.104 mmol) in 100 mL of methanol was added 2.5 g of Pearlman's catalyst (Aldrich Chemical Co.), and the mixture was stirred at ambient temperature for 14 hours under and atmosphere of hydrogen. An additional 2.5 g of catalyst was added, and the mixture was stirred for another 22 hours. The mixture was filtered, the filtrate was concentrated, and the residue was extracted with hexane/ether. After filtration, the solvent was removed by evaporation, and the residue was purified by flash chromatography (ethyl acetate:hexane 1:16) to yield 12.05 g of 4-t-butoxy-2,3,6-trifluoropyridine. MS 206 (M+H)+, 233 (M+18)+ ; 1H NMR (CDCl3)∂: 1.52 (s, 9H), 6.5 (m, 1H); 19F NMR (CDCl3, CFCl3 as reference)∂: 72.60 (dd, J1 =14.3, J2 =21.0 Hz), 89.74 (dd, J1 =14.3, J2 =21.0 Hz), 164.68 (dt, J1 =4.2, J2 =21.0 Hz).
Aufarbeitung
- filtrationThe mixture was filtered
- concentrationthe filtrate was concentrated
- extractionthe residue was extracted with hexane/ether
- filtrationAfter filtration
- customthe solvent was removed by evaporation
- customthe residue was purified by flash chromatography (ethyl acetate:hexane 1:16)
Quellen und Nachweise
- ORD-Eintrag
- ord-a114a9ea48c343e39f533457a6f464c2
- Quelldatensatz
- uspto-grants-1999_11
- Patentnummer
- US05977133
Verknüpfte Notizen
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