Hydrogen Bromide → 2-Bromo-5-iodo-3-nitropyridine

HRID 1862483

Reaktionsgleichung

Reaktionsgleichung von HRID 1862483
[I:1][C:2]1[CH:3]=[C:4]([N+:9]([O-:11])=[O:10])[C:5](N)=[N:6][CH:7]=1.N([O-])=O.[Na+].[NH4+].[OH-].[BrH:18]>>[I:1][C:2]1[CH:3]=[C:4]([N+:9]([O-:11])=[O:10])[C:5]([Br:18])=[N:6][CH:7]=1

Komponenten

5

Edukt 4

HCID 260Hydrogen BromideHCID 14923Ammonium HydroxideHCID 33844682-Amino-5-iodo-3-nitropyridineHCID 23668193Sodium Nitrite

Produkt 1

HCID 186197852-Bromo-5-iodo-3-nitropyridineAusbeute 23 %

Versuchsvorschrift

5-iodo-3-nitro-2-aminopyridine (5.6 g, 21.1 mmol) and concentrated HBr (60 mL) were stirred at room temperature for ten minutes. Sodium nitrite (11.7 g, 170 mmol) was then slowly added followed by CuBr (3.9 g, 27.2 mmol). Stirring continued overnight. The mixture was poured into 1:1 NH4OH:H2O, extracted with ethyl acetate, dried over sodium sulfate, then concentrated. The crude residue was purified by flash chromatography using 9:1 hexane:ethyl acetate to yield 5-iodo-3-nitro-2-bromopyridine (1.618 g, 23%) as a colorless solid.

Aufarbeitung

  1. extractionH2O, extracted with ethyl acetate
  2. dry with materialdried over sodium sulfate
  3. concentrationconcentrated
  4. customThe crude residue was purified by flash chromatography

Quellen und Nachweise

ORD-Eintrag
ord-f78044010f6442b0af80827b95acd521
Quelldatensatz
uspto-grants-2003_03
Patentnummer
US06538010B1

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