Hydrogen Bromide → 1'-Benzyl-3-(4-isopropylphenyl)-4,6,7-trimethylspiro[benzofuran-2(3H), 4'-piperidine]

HRID 1017865Notes

Reaction equation

HRID 1017865 reaction equation
[CH2:1]([N:8]1[CH2:13][CH2:12][CH:11]([C:14]([C:27]2[CH:32]=[CH:31][C:30]([CH:33]([CH3:35])[CH3:34])=[CH:29][CH:28]=2)([C:16]2[C:21]([CH3:22])=[CH:20][C:19]([CH3:23])=[C:18]([CH3:24])[C:17]=2[O:25]C)O)[CH2:10][CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Br.[OH-].[Na+]>C(O)(=O)C>[CH2:1]([N:8]1[CH2:13][CH2:12][C:11]2([CH:14]([C:27]3[CH:28]=[CH:29][C:30]([CH:33]([CH3:35])[CH3:34])=[CH:31][CH:32]=3)[C:16]3[C:21]([CH3:22])=[CH:20][C:19]([CH3:23])=[C:18]([CH3:24])[C:17]=3[O:25]2)[CH2:10][CH2:9]1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

5

Reactant 3

HCID 260Hydrogen BromideHCID 14798Sodium HydroxideHCID 21961358(1-Benzyl-4-piperidyl)(4-isopropylphenyl)(3,4,6-trimethyl-2-methoxyphenyl)methanol

Product 1

HCID 219613431'-Benzyl-3-(4-isopropylphenyl)-4,6,7-trimethylspiro[benzofuran-2(3H), 4'-piperidine]Yield 84.9%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

To a solution of (1-benzyl-4-piperidyl)(4-isopropylphenyl) (3,4,6-trimethyl-2-methoxyphenyl)methanol (5.61 g, 11.89 mmol) in acetic acid (40 ml) was added a 47% hydrobromic acid (50 ml) and the resulting mixture was refluxed with heating for 13 hours. The reaction mixture was cooled down to room temperature and then an 8 N aqueous solution of sodium hydroxide was added into the mixture until it became basic. The product was extracted with ethyl acetate. T he extracts were washed with an aqueous saturated solution of sodium chloride, dried on magnesium sulfate, filtered, and then concentrated under reduced pressure. The residue was crystallized from hexane to obtain 4.44 g (76% yield) of the title compound. Melting point: 125-128° C.

Workup

  1. temperaturethe resulting mixture was refluxed
  2. temperaturewith heating for 13 hours
  3. extractionThe product was extracted with ethyl acetate
  4. washT he extracts were washed with an aqueous saturated solution of sodium chloride
  5. customdried on magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customThe residue was crystallized from hexane

Sources & evidence

ORD record
ord-8185959be2dc4190b6b19aef3e7fed63
Source dataset
uspto-grants-2002_11
Patent number
US06479536B1

Reaction notes

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