Hydrochloric Acid → 1-(4-Methoxyphenyl)-4-(2,2,4,6,7-pentamethyl-3-methylidene-2,3-dihydro-1-benzofuran-5-yl)piperazine

HRID 1850403Notes

Reaction equation

HRID 1850403 reaction equation
Cl.[CH3:2][O:3][C:4]1[CH:9]=[CH:8][C:7]([N:10]2[CH2:15][CH2:14][N:13]([C:16]3[C:17]([CH3:31])=[C:18]([CH3:30])[C:19]4[O:23][C:22]([CH3:25])([CH3:24])[C:21]([CH3:27])(O)[C:20]=4[C:28]=3[CH3:29])[CH2:12][CH2:11]2)=[CH:6][CH:5]=1>C(#N)C>[CH3:2][O:3][C:4]1[CH:5]=[CH:6][C:7]([N:10]2[CH2:15][CH2:14][N:13]([C:16]3[C:17]([CH3:31])=[C:18]([CH3:30])[C:19]4[O:23][C:22]([CH3:24])([CH3:25])[C:21](=[CH2:27])[C:20]=4[C:28]=3[CH3:29])[CH2:12][CH2:11]2)=[CH:8][CH:9]=1

Participants

4

Reactant 2

HCID 313Hydrochloric AcidHCID 229356081-(2,2,3,4,6,7-Hexamethyl-3-hydroxy-2,3-dihydro-1-benzofuran-5-yl)-4-(4-methoxyphenyl)piperazine

Product 1

HCID 229355751-(4-Methoxyphenyl)-4-(2,2,4,6,7-pentamethyl-3-methylidene-2,3-dihydro-1-benzofuran-5-yl)piperazineYield 92.3%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

10% hydrochloric acid (5 mL) was added to a suspension of acetonitrile (15 mL) containing 5-[4-(4-methoxyphenyl)piperazin-1-yl]-2,2,3,4,6,7-hexamethyl-2,3-dihydro-1-benzofuran-3-ol (1.70 g, 4.14 mmol) obtained in Reference Example 105, and the mixture was stirred at room temperature for 6 hours. The reaction solution was concentrated under reduced pressure, and after that, 10% potassium carbonate aqueous solution was added to the residue so that the aqueous layer became alkaline. Then, extraction was performed using ethyl acetate. The organic layer was washed with water and saturated saline, and then dried using anhydrous sodium sulfate. The solvent was removed under reduced pressure, and the obtained residue was crystallized using ethanol to give 1.50 g of the title compound (yield: 92%)

Workup

  1. customobtained in Reference Example 105
  2. concentrationThe reaction solution was concentrated under reduced pressure
  3. additionafter that, 10% potassium carbonate aqueous solution was added to the residue so that the aqueous layer
  4. extractionThen, extraction
  5. washThe organic layer was washed with water and saturated saline
  6. customdried
  7. customThe solvent was removed under reduced pressure
  8. customthe obtained residue was crystallized

Sources & evidence

ORD record
ord-a1b6d9c52aa54d268b5dbf3519bcdc23
Source dataset
uspto-grants-2015_02
Patent number
US08957069B2

Reaction notes

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