1-Bromopentane → 4-bromo-1-pentyl-1H-indole

HRID 545660Notes

Reaction equation

HRID 545660 reaction equation
[H-].[Na+].[Br:3][C:4]1[CH:12]=[CH:11][CH:10]=[C:9]2[C:5]=1[CH:6]=[CH:7][NH:8]2.Br[CH2:14][CH2:15][CH2:16][CH2:17][CH3:18]>CN(C)C=O>[Br:3][C:4]1[CH:12]=[CH:11][CH:10]=[C:9]2[C:5]=1[CH:6]=[CH:7][N:8]2[CH2:14][CH2:15][CH2:16][CH2:17][CH3:18]

Participants

5

Reactant 3

HCID 80571-BromopentaneHCID 24758Sodium hydrideHCID 6764944-Bromoindole

Product 1

HCID 666426354-bromo-1-pentyl-1H-indoleYield 98%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a mixture of sodium hydride (2.54 g, 66.3 mmol, 60% dispersion in mineral oil) in anhydrous N,N-dimethylformamide (50.0 mL) was added 4-bromoindole (10.0 g, 51.0 mmol) at 0° C. The reaction mixture was stirred for 0.5 h followed by the addition of 1-bromopentane (9.25 g, 61.2 mmol) at 0° C. The reaction mixture was stirred at ambient temperature for 6 h and quenched with brine solution (20.0 mL). The reaction mixture was diluted with water (100 mL) and extracted with ether (3×200 mL). The combined organic layers was washed with brine (100 mL), dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo to dryness. The residue was subjected to column chromatography eluting with hexane (100%) to give the title compound (13.3 g, 98%) as a yellow oil: 1H NMR (300 MHz, CDCl3) δ 7.30-7.27 (m, 2H), 7.14 (t, 1H), 6.88 (t, 1H), 6.55 (d, 1H), 4.08 (t, 2H), 1.87-1.77 (m, 2H), 1.39-1.22 (m, 4H), 0.89 (t, 3H); 13C NMR (75 MHz, CDCl3) δ 136.3, 129.2, 128.4, 122.2, 122.1, 114.9, 108.7, 101.3, 46.8, 29.9, 29.1, 22.3, 13.9.

Workup

  1. stirringThe reaction mixture was stirred at ambient temperature for 6 h
  2. customquenched with brine solution (20.0 mL)
  3. additionThe reaction mixture was diluted with water (100 mL)
  4. extractionextracted with ether (3×200 mL)
  5. washThe combined organic layers was washed with brine (100 mL)
  6. dry with materialdried over anhydrous sodium sulfate
  7. filtrationfiltered
  8. concentrationThe filtrate was concentrated in vacuo to dryness
  9. washeluting with hexane (100%)

Sources & evidence

ORD record
ord-0475d62a798d4183bdfc818037d69b86
Source dataset
uspto-grants-2011_05
Patent number
US07935721B2

Reaction notes

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