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

HRID 734815Notes

Reaction equation

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

Participants

Conditions

Temperature: 0 °C

Procedure

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).

Workup

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

Sources & evidence

ORD record: ord-8d394aa56b1a4864ac852ddd2f068389
Source dataset: uspto-grants-2009_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07592358B2

Reaction notes

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