Iodoethane → 1-Ethyl-2-methyl-6-nitro-1H-indole

HRID 2079914

Reaction equation

HRID 2079914 reaction equation
[CH3:1][C:2]1[NH:3][C:4]2[C:9]([CH:10]=1)=[CH:8][CH:7]=[C:6]([N+:11]([O-:13])=[O:12])[CH:5]=2.C[Si](C)(C)[N-][Si](C)(C)C.[Na+].I[CH2:25][CH3:26].C(OCC)(=O)C>CN(C=O)C>[CH2:25]([N:3]1[C:4]2[C:9](=[CH:8][CH:7]=[C:6]([N+:11]([O-:13])=[O:12])[CH:5]=2)[CH:10]=[C:2]1[CH3:1])[CH3:26]

Participants

6

Reactant 4

HCID 6340IodoethaneHCID 8857Ethyl AcetateHCID 6005082-Methyl-6-nitro-1H-indoleHCID 2724254Sodium bis(trimethylsilyl)amide

Product 1

HCID 574422751-Ethyl-2-methyl-6-nitro-1H-indoleYield 100%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

Cool a solution of 2-methyl-6-nitro-1H-indole, 18 (0.31 g, 1.76 mmol) in anhydrous DMF (5 mL) under inert atmosphere at 0° C. Add sodium hexamethyldisilazide (1.0M in THF, 1.9 mL, 1.9 mmol) and stir 5 minutes. Add iodoethane (filtered through basic alumina) (0.43 mL, 5.28 mmol), warm to ambient temperature, and stir 2 hours. Quench the reaction with saturated aqueous sodium bicarbonate, add ethyl acetate, and wash with saturated aqueous sodium bicarbonate followed by saturated aqueous brine. Dry the organic layer over sodium sulfate, filter, and concentrate in vacuo. Chromatograph over silica gel using hexanes/ethyl acetate (9:1) to afford the title compound, (0.36 g, 100%). 1H NMR (CDCl3, 300 MHz) δ 2.47 (s, 31), 4.18 (q, J=7.1 Hz, 2), 6.23 (s, 3H), 7.48 (d, J=8.8 Hz, 1H), 7.95 (dd, J=1.9, 8.6 Hz, 1H), 8.23 (d, J=1.9 Hz, 1H).

Workup

  1. customQuench
  2. customthe reaction with saturated aqueous sodium bicarbonate
  3. washwash with saturated aqueous sodium bicarbonate
  4. dry with materialDry the organic layer over sodium sulfate
  5. filtrationfilter
  6. concentrationconcentrate in vacuo

Sources & evidence

ORD record
ord-8c02373d2b1848c2b67e6759d8ead9b2
Source dataset
uspto-grants-2011_04
Patent number
US07932284B2

Linked notes

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