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Potassium Carbonate → 5-Nitro-3',6'-dihydro-2'H-[2,4]bipyridinyl-1'-carboxylic acid tert-butyl ester

HRID 557725
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 557725
Br[C:2]1[CH:7]=[CH:6][C:5]([N+:8]([O-:10])=[O:9])=[CH:4][N:3]=1.[C:11]([O:15][C:16]([N:18]1[CH2:23][CH:22]=[C:21](B2OC(C)(C)C(C)(C)O2)[CH2:20][CH2:19]1)=[O:17])([CH3:14])([CH3:13])[CH3:12].C(=O)([O-])[O-].[K+].[K+]>C1(C)C=CC=CC=1.C(O)C>[C:11]([O:15][C:16]([N:18]1[CH2:19][CH:20]=[C:21]([C:2]2[CH:7]=[CH:6][C:5]([N+:8]([O-:10])=[O:9])=[CH:4][N:3]=2)[CH2:22][CH2:23]1)=[O:17])([CH3:14])([CH3:12])[CH3:13]
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Komponenten

6

Edukt 3

HCID 11430Potassium CarbonateHCID 782402-Bromo-5-nitropyridineHCID 4642098Tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridine-1-carboxylate

Produkt 1

HCID 591285695-Nitro-3',6'-dihydro-2'H-[2,4]bipyridinyl-1'-carboxylic acid tert-butyl esterAusbeute 53,3 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 702
Ethanol
Lösungsmittel
HCID 1140TolueneLösungsmittel

Reaktionsbedingungen

Temperatur
100 °C

Versuchsvorschrift

To a mixture of 2-bromo-5-nitropyridine (0.5 g, 2.46 mmol) and N-tert-butoxycarbonyl-1,2,3,6-tetrahydropyridine-4-boronic acid pinacol ester (0.913 g, 2.95 mmol) in toluene (4 mL) and ethanol (1.0 mL) was added potassium carbonate solution (2M, 2 mL) and PdCl2dppf (180 mg, 0.246 mmol). The mixture was degassed with argon and heated to 100° C. in a microwave for 40 minutes with stirring. The solvents were evaporated and the residue was extracted with ethyl acetate. After evaporation of the solvents, the residue was purified using flash chromatography (eluting with ethyl acetate and hexanes) to give 5-nitro-3′,6′-dihydro-2′H-[2,4′]bipyridinyl-1′-carboxylic acid tert-butyl ester as a solid (400 mg). The NMR spectrum obtained on the sample is compatible with its structure.

Aufarbeitung

  1. customThe mixture was degassed with argon
  2. customThe solvents were evaporated
  3. extractionthe residue was extracted with ethyl acetate
  4. customAfter evaporation of the solvents
  5. customthe residue was purified
  6. washflash chromatography (eluting with ethyl acetate and hexanes)

Quellen und Nachweise

ORD-Eintrag
ord-85dc7c1d29694dbe805527ab5c4a6876
Quelldatensatz
uspto-grants-2011_11
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US08058299B2

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