Sodium Iodide → 2-Bromo-1-[3-(t-butyldimethylsilanyloxy)-2-(tetrahydropyran-2-yloxy)propyl]-4-nitroimidazole

HRID 2221418Notes

Reaction equation

HRID 2221418 reaction equation
[Br:1][C:2]1[NH:3][CH:4]=[C:5]([N+:7]([O-:9])=[O:8])[N:6]=1.[Si:10]([O:17][CH2:18][CH:19]([O:22][CH:23]1[CH2:28][CH2:27][CH2:26][CH2:25][O:24]1)[CH2:20]Cl)([C:13]([CH3:16])([CH3:15])[CH3:14])([CH3:12])[CH3:11].C(=O)([O-])[O-].[K+].[K+].[I-].[Na+]>CN(C)C=O>[Br:1][C:2]1[N:3]([CH2:20][CH:19]([O:22][CH:23]2[CH2:28][CH2:27][CH2:26][CH2:25][O:24]2)[CH2:18][O:17][Si:10]([C:13]([CH3:16])([CH3:14])[CH3:15])([CH3:12])[CH3:11])[CH:4]=[C:5]([N+:7]([O-:9])=[O:8])[N:6]=1

Participants

6

Reactant 4

HCID 5238Sodium IodideHCID 11430Potassium CarbonateHCID 477542-Bromo-4-nitro-1H-imidazoleHCID 230802371-(t-Butyldimethylsilanyloxy)-3-chloro-2-(tetrahydropyran-2-yloxy)propane

Product 1

HCID 230802502-Bromo-1-[3-(t-butyldimethylsilanyloxy)-2-(tetrahydropyran-2-yloxy)propyl]-4-nitroimidazoleYield 70.3%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
110 °C

Procedure

2-Bromo-4-nitroimidazole (7.63 g) and 1-(tert-butyldimethylsilanyloxy)-3-chloro-2-(tetrahydropyran-2-yloxy)propane (12 g) were dissolved in N,N-dimethylformamide (80 ml), then potassium carbonate (6.6 g) and sodium iodide (6.3 g) were added thereto, and the reaction mixture was heated and stirred at 110° C. for 12 hours. Ice-water (240 ml) was added, extracted twice with ethyl acetate (150 ml), and the extracts were combined together and washed with an aqueous solution being saturated with sodium chloride (100 ml), then dried over anhydrous magnesium sulfate. After being filtrated under a reduced pressure, the filtrate was concentrated under a reduced pressure. The residue obtained was purified by use of a silica gel column chromatography (eluent: dichloromethane/ethyl acetate=100/1), there was obtained 2-bromo-1-[3-(t-butyldimethylsilanyloxy)-2-(tetrahydropyran-2-yloxy)propyl]-4-nitroimidazole (12.69 g, yield: 68.7%)

Workup

  1. temperaturethe reaction mixture was heated
  2. extractionextracted twice with ethyl acetate (150 ml)
  3. washwashed with an aqueous solution
  4. dry with materialdried over anhydrous magnesium sulfate
  5. filtrationAfter being filtrated under a reduced pressure
  6. concentrationthe filtrate was concentrated under a reduced pressure
  7. customThe residue obtained
  8. customwas purified by use of a silica gel column chromatography (eluent: dichloromethane/ethyl acetate=100/1)

Sources & evidence

ORD record
ord-3c13a97aff9d4265a7db2193946190c5
Source dataset
uspto-grants-2008_05
Patent number
US07368579B2

Reaction notes

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