Imidazole → 4-(t-Butyldimethylsilyloxy)indole

HRID 2393947Notes

Reaction equation

HRID 2393947 reaction equation
[OH:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH:4]=[CH:5][NH:6]2.[Si:11](Cl)([C:14]([CH3:17])([CH3:16])[CH3:15])([CH3:13])[CH3:12].N1C=CN=C1.[Cl-].[NH4+]>CN(C)C=O>[Si:11]([O:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH:4]=[CH:5][NH:6]2)([C:14]([CH3:17])([CH3:16])[CH3:15])([CH3:13])[CH3:12]

Participants

6

Reactant 4

HCID 795ImidazoleHCID 25517Ammonium ChlorideHCID 28928tert-Butyldimethylsilyl chlorideHCID 754211H-indol-4-ol

Product 1

HCID 115939764-(t-Butyldimethylsilyloxy)indoleYield 100%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

A solution of 4-hydroxyindole (3.0 g, 22.5 mmol), t-butyldimethylsilyl chloride (5.09 g, 33.8 mmol) and imidazole (3.83 g, 56.3 mmol) in dimethylformamide (60 mL) was stirred at room temperature for 24 hours. Aqueous ammonium chloride was added (100 ml) and extracted several times with ethyl acetate. The organic layers were combined, dried over magnesium sulfate, and evaporated to give a crude oil. Flash chromatography (10% ethyl acetate/hexanes) yielded the desired product (5.55 g, 100%) as a white solid. NMR.

Workup

  1. extractionextracted several times with ethyl acetate
  2. dry with materialdried over magnesium sulfate
  3. customevaporated
  4. customto give a crude oil

Sources & evidence

ORD record
ord-2e126fbba76447b193066a7516b45dca
Source dataset
uspto-grants-1998_09
Patent number
US05808080

Reaction notes

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