1-Bromo-2-methylpropane → HCID 25247760, compound

HRID 546062Notes

Reaction equation

HRID 546062 reaction equation
[N+:1]([C:4]1[CH:8]=[CH:7][NH:6][N:5]=1)([O-:3])=[O:2].[H-].[Na+].Br[CH2:12][CH:13]([CH3:15])[CH3:14]>CN(C)C=O.C(OCC)(=O)C>[N+:1]([C:4]1[CH:8]=[CH:7][N:6]([CH2:12][CH:13]([CH3:15])[CH3:14])[N:5]=1)([O-:3])=[O:2]

Participants

6

Reactant 3

HCID 65551-Bromo-2-methylpropaneHCID 24758Sodium hydrideHCID 178526745HCID 178526745, compound

Product 1

HCID 25247760HCID 25247760, compoundYield 55.1%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

3-Nitro-1H-pyrazole (prepared in example 3, 100 mg, 0.89 mmol) was dissolved in anhydrous N,N-dimethylformamide (4 mL) and a 60% dispersion of sodium hydride in mineral oil (42 mg, 1.06 mmol) was added while stirring under nitrogen. After the effervescence ceased and the reaction stirred for an additional 10 min before 1-bromo-2-methyl-propane (115 μL, 1.06 mmol) was added. The reaction continued to stir under nitrogen for 4 h. The reaction was stored at −25° C. for 16 h. The solution was diluted with ethyl acetate (30 mL), washed with water (2×10 mL), saturated aqueous brine solution (10 mL), dried over magnesium sulfate, filtered and concentrated in vacuo. Purification by ISCO flash column chromatography (Teledyne Isco RediSep Flash Column 10 g; 25% ethyl acetate/hexanes to 75% ethyl acetate/hexanes) afforded 3-nitro-1-iso-butyl-1H-pyrazole (83 mg, 46%) as a white powder.

Workup

  1. additionwas added
  2. stirringto stir under nitrogen for 4 h
  3. washwashed with water (2×10 mL), saturated aqueous brine solution (10 mL)
  4. dry with materialdried over magnesium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customPurification by ISCO flash column chromatography (Teledyne Isco RediSep Flash Column 10 g; 25% ethyl acetate/hexanes to 75% ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-69b880bd291e4bee83967c4fc1d3de7b
Source dataset
uspto-grants-2011_05
Patent number
US07935699B2

Reaction notes

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