Imidazole → 2-Bromo-6-[[(1,1-dimethylethyl)dimethylsilyl]oxy]naphthalene

HRID 2404144Notes

Reaction equation

HRID 2404144 reaction equation
[Br:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH:8]=[C:7]([OH:12])[CH:6]=[CH:5]2.N1C=CN=C1.[CH3:18][C:19]([Si:22](Cl)([CH3:24])[CH3:23])([CH3:21])[CH3:20]>CN(C=O)C>[Br:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH:8]=[C:7]([O:12][Si:22]([C:19]([CH3:21])([CH3:20])[CH3:18])([CH3:24])[CH3:23])[CH:6]=[CH:5]2

Participants

5

Reactant 3

HCID 795ImidazoleHCID 271446-Bromo-2-naphthalenolHCID 28928tert-Butyldimethylsilyl chloride

Product 1

HCID 134730832-Bromo-6-[[(1,1-dimethylethyl)dimethylsilyl]oxy]naphthaleneYield 155%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of compound 6-bromonaphthalen-2-ol (10 g, 0.044 mol, 1.0 equiv) and imidazole (6 g, 0.088 mol, 2.0 equiv) in dry DMF (100 mL) was added TBDMSCl (10 g, 0.066 mol, 1.5 equiv) at 0° C. Then the reaction mixture was warmed to r.t and stirred for 3 h. Then DMF was removed under reduced pressure. The mixture was extracted with ethyl acetate and washed with brine, dried over Na2SO4 and concentrated to obtain crude product. The crude product was purified by silica gel chromatography (PE:EA=30:1) to give compound to give the title compound as a yellow solid (23 g, 76%). ESI-MS (M+H)+: 336.9. 1H NMR (400 MHz, CDCl3) δ: 7.91-7.92 (m, 1H), 7.64-7.46 (m, 3H), 7.15-7.08 (m, 2H), 1.01 (s, 9H), 0.24 (s, 6H).

Workup

  1. temperatureThen the reaction mixture was warmed
  2. customThen DMF was removed under reduced pressure
  3. extractionThe mixture was extracted with ethyl acetate
  4. washwashed with brine
  5. dry with materialdried over Na2SO4
  6. concentrationconcentrated
  7. customto obtain crude product
  8. customThe crude product was purified by silica gel chromatography (PE:EA=30:1)
  9. customto give compound

Sources & evidence

ORD record
ord-1f0d7e549327420cb08adf528a294842
Source dataset
uspto-grants-2014_08
Patent number
US08802659B2

Reaction notes

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