Methyl iodide → 1-Methyl-1H-indole-4-carbonitrile

HRID 2041222Notes

Reaction equation

HRID 2041222 reaction equation
[NH:1]1[C:9]2[CH:8]=[CH:7][CH:6]=[C:5]([C:10]#[N:11])[C:4]=2[CH:3]=[CH:2]1.[H-].[Na+].I[CH3:15]>CN(C=O)C.[NH4+].[OH-]>[CH3:15][N:1]1[C:9]2[CH:8]=[CH:7][CH:6]=[C:5]([C:10]#[N:11])[C:4]=2[CH:3]=[CH:2]1

Participants

6

Reactant 3

HCID 6328Methyl iodideHCID 24758Sodium hydrideHCID 38176024-Cyanoindole

Product 1

HCID 223915921-Methyl-1H-indole-4-carbonitrileYield 90.9%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolvent2×HCID 14923Ammonium HydroxideSolvent

Procedure

Add slowly a solution of indole-4-carbonitrile (1.0 g, 7.04 mmol) in anhydrous DMF (5 mL) to a suspension of sodium hydride (60% dispersion in mineral oil, 0.6 g, 8.64 mmol) in anhydrous DMF (2 mL) at 0° C. and warm the reaction mixture to ambient temperature. Add iodomethane (0.7 mL, 10.6 mmol) and stir the reaction for 1 h at ambient temperature. Dilute the reaction mixture with 1M aqueous NH4OH (30 mL) and extract with diethyl ether (3×10 mL). Combine the organic extracts, dry over anhydrous Na2SO4, concentrate in vacuo and purify by chromatography on silica gel eluting with hexane/EtOAc (1:0, 9:1, 4:1 and 7:3) to obtain the desired intermediate as a yellow oil (1.0 g, 87%). GC-MS m/z: 156 (M+).

Workup

  1. customthe reaction for 1 h at ambient temperature
  2. extractionextract with diethyl ether (3×10 mL)
  3. dry with materialCombine the organic extracts, dry over anhydrous Na2SO4
  4. concentrationconcentrate in vacuo
  5. custompurify by chromatography on silica gel eluting with hexane/EtOAc (1:0, 9:1, 4:1 and 7:3)

Sources & evidence

ORD record
ord-c46aa5827d734acab124d5b0db562475
Source dataset
uspto-grants-2013_11
Patent number
US08580780B2

Reaction notes

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