Azobisisobutyronitrile → 2-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazole-4-carbonitrile

HRID 930119Notes

Reaction equation

HRID 930119 reaction equation
[CH3:1][Si:2]([CH3:15])([CH3:14])[CH2:3][CH2:4][O:5][CH2:6][N:7]1[CH:11]=[C:10]([C:12]#[N:13])[N:9]=[CH:8]1.[Br:16]N1C(=O)CCC1=O.N(C(C)(C)C#N)=NC(C)(C)C#N>C(Cl)(Cl)(Cl)Cl.CCOC(C)=O>[Br:16][C:8]1[N:7]([CH2:6][O:5][CH2:4][CH2:3][Si:2]([CH3:15])([CH3:14])[CH3:1])[CH:11]=[C:10]([C:12]#[N:13])[N:9]=1

Participants

6

Reactant 3

HCID 6547AzobisisobutyronitrileHCID 67184N-bromobutanimideHCID 584311371-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazole-4-carbonitrile

Product 1

HCID 579205782-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-imidazole-4-carbonitrileYield 77.9%

Reagents, catalysts & solvents 2

HCID 5943Carbon TetrachlorideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
60 °C

Procedure

To a solution of 1-(2-trimethylsilanyl-ethoxymethyl)-1H-imidazole-4-carbonitrile (0.70 g, 3.1 mmol) (as prepared in the previous step) in CCl4 (10 mL) was added N-bromosuccinimide (NBS) (0.61 g, 3.4 mmol) and azobis(isobutyronitrile) (AIBN, catalytic), and the mixture was heated at 60° C. for 4 h. The reaction was diluted with EtOAc (30 mL), washed with NaHCO3 (2×30 mL), brine (30 mL), the organic layer was dried over Na2SO4 and then concentrated. The title compound was eluted from a 20-g SPE cartridge (silica) with 30% EtOAc/hexane to give 0.73 g (77%) of a yellow solid: Mass spectrum (CI (CH4), m/z) Calcd. for C10H16BrN3OSi, 302.0/304.0 (M+H). found 302.1/304.1.

Workup

  1. washwashed with NaHCO3 (2×30 mL), brine (30 mL)
  2. dry with materialthe organic layer was dried over Na2SO4
  3. concentrationconcentrated
  4. washThe title compound was eluted from a 20-g SPE cartridge (silica) with 30% EtOAc/hexane

Sources & evidence

ORD record
ord-cf8ac6d395fc4a8e90f518d9cf849c05
Source dataset
uspto-grants-2016_03
Patent number
US09296726B2

Reaction notes

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