Water → N-(3-(3-Formylphenyl)-3-hydroxy-2,2,6,7-tetramethyl-2,3-dihydro-1-benzofuran-5-yl)-3,3-dimethylbutanamide

HRID 1787347Notes

Reaction equation

HRID 1787347 reaction equation
[O:1]1CCO[CH:2]1[C:6]1[CH:7]=[C:8]([C:12]2([OH:33])[C:16]3[CH:17]=[C:18]([NH:23][C:24](=[O:30])[CH2:25][C:26]([CH3:29])([CH3:28])[CH3:27])[C:19]([CH3:22])=[C:20]([CH3:21])[C:15]=3[O:14][C:13]2([CH3:32])[CH3:31])[CH:9]=[CH:10][CH:11]=1.O.C1(C)C=CC(S([O-])(=O)=O)=CC=1.[NH+]1C=CC=CC=1>CC(C)=O>[CH:2]([C:6]1[CH:7]=[C:8]([C:12]2([OH:33])[C:16]3[CH:17]=[C:18]([NH:23][C:24](=[O:30])[CH2:25][C:26]([CH3:27])([CH3:28])[CH3:29])[C:19]([CH3:22])=[C:20]([CH3:21])[C:15]=3[O:14][C:13]2([CH3:32])[CH3:31])[CH:9]=[CH:10][CH:11]=1)=[O:1]

Participants

5

Reactant 3

HCID 962Water2×HCID 466102Benzenesulfonic acid, 4-methyl-, compd. with pyridine (1:1)HCID 23114094N-(3-(3-(1,3-dioxolan-2-yl)phenyl)-3-hydroxy-2,2,6,7-tetramethyl-2,3-dihydro-1-benzofuran-5-yl)-3,3-dimethylbutanamide

Product 1

HCID 23113985N-(3-(3-Formylphenyl)-3-hydroxy-2,2,6,7-tetramethyl-2,3-dihydro-1-benzofuran-5-yl)-3,3-dimethylbutanamideYield 72%

Reagents, catalysts & solvents 1

HCID 180AcetoneSolvent

Procedure

To a solution of 2-(3-bromophenyl)-1,3-dioxolane (1.65 mL, 10.9 mmol) in THF (20 mL) was added dropwise at −78° C. under an argon atmosphere n-butyllithium (1.59 M hexane solution, 6.4 mL, 10.2 mmol), and the resulting mixture was stirred for 30 minutes. To the reaction solution was added dropwise at −78° C. a solution of 3,3-dimethyl-N-(2,2,6,7-tetramethyl-3-oxo-2,3-dihydro-1-benzofuran-5-yl)butanamide (1.0 g, 3.30 mmol) obtained in Reference Example 65 in THF (10 mL), and the resulting mixture was stirred for 30 minutes. The reaction solution was warmed to room temperature and stirred for 1 hour, and water was added to the reaction solution and the product was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (ethyl acetate:hexane=2:3) to obtain 1.38 g (yield: 92%) of N-(3-(3-(1,3-dioxolan-2-yl)phenyl)-3-hydroxy-2,2,6,7-tetramethyl-2,3-dihydro-1-benzofuran-5-yl)-3,3-dimethylbutanamide as an amorphous powder. To a mixed solution of the obtained N-(3-(3-(1,3-dioxolan-2-yl)phenyl)-3-hydroxy-2,2,6,7-tetramethyl-2,3-dihydro-1-benzofuran-5-yl)-3,3-dimethylbutanamide (300 mg, 0.66 mmol) in acetone (4 mL)-water (0.3 mL) was added pyridinium p-toluenesulfonate (5 mg, 0.03 mmol), and the mixture was stirred for 30 minutes. The reaction solution was cooled to room temperature, and water was added to the reaction solution and the product was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The obtained residue was recrystallized from THF-diisopropyl ether to obtain 194 mg (yield: 72%) of the title compound. Melting point: 189-190° C.

Workup

  1. extractionthe product was extracted with ethyl acetate
  2. washThe organic layer was washed with water and saturated brine
  3. dry with materialdried over anhydrous sodium sulfate
  4. concentrationconcentrated under reduced pressure
  5. customThe obtained residue was recrystallized from THF-diisopropyl ether

Sources & evidence

ORD record
ord-9257c40e2a744189bec7fe5243ba4197
Source dataset
uspto-grants-2009_03
Patent number
US07507841B2

Reaction notes

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