Hydrogen Bromide → 2,3-Dibromo-5-(4-chlorophenyl)pyridine

HRID 734815Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 734815
N([O-])=O.[Na+].[Br:5][C:6]1[C:11](N)=[CH:10][C:9]([C:13]2[CH:18]=[CH:17][C:16]([Cl:19])=[CH:15][CH:14]=2)=[CH:8][N:7]=1.[BrH:20]>O>[Br:5][C:6]1[C:11]([Br:20])=[CH:10][C:9]([C:13]2[CH:18]=[CH:17][C:16]([Cl:19])=[CH:15][CH:14]=2)=[CH:8][N:7]=1

Komponenten

5

Edukt 3

HCID 260Hydrogen Bromide2×HCID 23668193Sodium NitriteHCID 859697042-Bromo-5-(4-chloro-phenyl)-pyridin-3-ylamine

Produkt 1

HCID 860770432,3-Dibromo-5-(4-chlorophenyl)pyridine

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel3×

Reaktionsbedingungen

Temperatur
0 °C

Versuchsvorschrift

A solution of 0.33 g (4.85 mmol) of sodium nitrite in 1.9 mL of water was added at 0° C. with vigorous stirring to a suspension of 1.25 g (4.41 mmol) of 2-bromo-5-(4-chlorophenyl)pyridin-3-ylamine in 9.90 mL (88.16 mmol) of 48% aqueous HBr and 9.90 mL of water and stirred for a further 10 minutes at 0° C. Subsequently a solution of 0.95 g (6.61 mmol) of CuBr in 3.47 mL of 48% aqueous HBr was added and the mixture was stirred for I hour at 60° C. The reaction mixture was diluted with water and exhaustively extracted with EtOAc. The combined organic extracts were washed with saturated aqueous sodium bicarbonate solution and water, dried over magnesium sulfate, and evaporated down in vacuo. The residue was purified by column chromatography (silica gel, PE/DCM 1:1). Yield: 1.00 g (65% of theoretical); C11H6Br2ClN (M=347.433); calc.: molpeak (M+H)+:346/348/350/352 (2BrCl); found: molpeak (M+H)+: 346/348/350/352 (2BrCl).

Aufarbeitung

  1. stirringthe mixture was stirred for I hour at 60° C
  2. extractionexhaustively extracted with EtOAc
  3. washThe combined organic extracts were washed with saturated aqueous sodium bicarbonate solution and water
  4. dry with materialdried over magnesium sulfate
  5. customevaporated down in vacuo
  6. customThe residue was purified by column chromatography (silica gel, PE/DCM 1:1)

Quellen und Nachweise

ORD-Eintrag
ord-8d394aa56b1a4864ac852ddd2f068389
Quelldatensatz
uspto-grants-2009_09
Patentnummer
US07592358B2

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