Phenethyl bromide → (3aS-cis)-1,2,3,3a,8,8a-hexahydro-5-methoxy-1-(2-phenylethyl)-3a,8-dimethylpyrrolo[2,3-b]indole

HRID 1684258Notes

Reaction equation

HRID 1684258 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:9](=[CH:10][CH:11]=1)[N:8]([CH3:12])[CH:7]1[NH:13][CH2:14][CH2:15][C:6]21[CH3:16].Br[CH2:18][CH2:19][C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1>>[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:9](=[CH:10][CH:11]=1)[N:8]([CH3:12])[C@H:7]1[N:13]([CH2:18][CH2:19][C:20]3[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=3)[CH2:14][CH2:15][C@@:6]21[CH3:16]

Participants

3

Reactant 2

HCID 7666Phenethyl bromideHCID 612787HCID 612787, compound

Product 1

HCID 57011492(3aS-cis)-1,2,3,3a,8,8a-hexahydro-5-methoxy-1-(2-phenylethyl)-3a,8-dimethylpyrrolo[2,3-b]indole

Procedure

A stirred mixture, under nitrogen, of 8.73 g of 1,2,3,3a,8,8a-hexahydro-5-methoxy-3a,8-dimethylpyrrolo[2,3-b]-indole, 9,25 g of 2-(bromoethyl)benzene and 8.29 g of milled, anhydrous potassium carbonate in 75 ml of degassed, dry dimethylformamide is heated at 70°-75° for 8 hours and thereafter stirred at room temperature overnight. The reaction mixture is decanted into 1.5 liters of water and the product is extracted into ethyl acetate (2×250 ml). The combined organic extracts are washed twice with saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate and then concentrated. The residue is subjected to flash chromatography over silica gel using methanol/ethyl acetate mixtures as eluent. The fractions containing the product are combined and concentrated to afford pure (3aS-cis)-1,2,3,3a,8,8a-hexahydro-5-methoxy-1-(2-phenylethyl)-3a,8-dimethylpyrrolo[2,3-b]indole.

Workup

  1. customanhydrous potassium carbonate in 75 ml of degassed
  2. temperaturedry dimethylformamide is heated at 70°-75° for 8 hours
  3. customThe reaction mixture is decanted into 1.5 liters of water
  4. extractionthe product is extracted into ethyl acetate (2×250 ml)
  5. washThe combined organic extracts are washed twice with saturated aqueous sodium chloride solution
  6. dry with materialdried over anhydrous sodium sulfate
  7. concentrationconcentrated
  8. additionThe fractions containing the product
  9. concentrationconcentrated

Sources & evidence

ORD record
ord-56fe3b1736c0486f8dc6958fc7dc0777
Source dataset
uspto-grants-1997_06
Patent number
US05639892

Reaction notes

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