Indole → Indole-3-Carboxaldehyde

HRID 1887504Notes

Reaction equation

HRID 1887504 reaction equation
P(Cl)(Cl)(Cl)=O.[NH:6]1[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[CH:8]=[CH:7]1.[OH-].[Na+].CN([CH:20]=[O:21])C>>[NH:6]1[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[C:8]([CH:20]=[O:21])=[CH:7]1

Participants

5

Reactant 4

HCID 798IndoleHCID 6228DimethylformamideHCID 14798Sodium HydroxideHCID 24813Phosphorus oxychloride

Product 1

HCID 10256Indole-3-Carboxaldehyde

Conditions

Temperature
0 °C

Procedure

Phosphorus oxychloride (1.2 eq) was added slowly to ice-cold DMF and the resulting mixture was stirred at 0° C. for 30 minutes. To this was added a solution of indole A1 (1 eq) in DMF and the mixture continued to stir for 6 hours. The reaction mixture was poured into an ice/water mixture and pH was adjusted to 7 by adding 1N NaOH. The compound was extracted with ethyl acetate (4×) and the combined organic layers were washed with brine, dried (Na2SO4), filtered, and concentrated under reduced pressure. The crude material was purified by silica gel chromatography (typical eluents hexanes and ethyl acetate) to afford the desired indole 3-carboxaldehyde D1. The product structure was confirmed by 1H NMR and mass analysis.

Workup

  1. stirringto stir for 6 hours
  2. extractionThe compound was extracted with ethyl acetate (4×)
  3. washthe combined organic layers were washed with brine
  4. dry with materialdried (Na2SO4)
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe crude material was purified by silica gel chromatography (typical eluents hexanes and ethyl acetate)

Sources & evidence

ORD record
ord-0eeab2321a8241c38feb2394192048d9
Source dataset
uspto-grants-2013_08
Patent number
US08501729B2

Reaction notes

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