Acetyl chloride → HCID 11430128, compound

HRID 1787234Notes

Reaction equation

HRID 1787234 reaction equation
[CH:1]([C:4]1[CH:9]=[CH:8][C:7]([C@@H:10]2[C:14]3[C:15]([CH3:28])=[C:16]([NH:20][C:21](=[O:27])[CH2:22][C:23]([CH3:26])([CH3:25])[CH3:24])[C:17]([CH3:19])=[CH:18][C:13]=3[O:12][CH2:11]2)=[CH:6][CH:5]=1)([CH3:3])[CH3:2].[Cl-].[Al+3].[Cl-].[Cl-].[C:33](Cl)(=[O:35])[CH3:34]>ClCCl>[C:33]([C:18]1[C:13]2[O:12][CH2:11][C@H:10]([C:7]3[CH:6]=[CH:5][C:4]([CH:1]([CH3:2])[CH3:3])=[CH:9][CH:8]=3)[C:14]=2[C:15]([CH3:28])=[C:16]([NH:20][C:21](=[O:27])[CH2:22][C:23]([CH3:26])([CH3:25])[CH3:24])[C:17]=1[CH3:19])(=[O:35])[CH3:34]

Participants

5

Reactant 3

HCID 6367Acetyl chlorideHCID 6451240Aluminum(III) ChlorideHCID 68706693HCID 68706693, compound

Product 1

HCID 11430128HCID 11430128, compoundYield 84.2%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
10 °C

Procedure

To a solution of (+)-N-((3R)-3-(4-isopropylphenyl)-4,6-dimethyl-2,3-dihydro-1-benzofuran-5-yl)-3,3-dimethylbutanamide (933 mg, 2.46 mmol) obtained in Example 37 in dichloromethane (20 mL) was added aluminum chloride (721 mg, 5.40 mmol) at −70° C. under an argon atmosphere and the mixture was stirred for 20 minutes. To the reaction solution was added dropwise acetyl chloride (424 mg, 5.40 mmol) at the same temperature and the reaction mixture was gradually warmed to 10° C. The reaction solution was added to ice, the organic layer was separated and the aqueous layer was extracted with ethyl acetate. The combined organic layers were washed with water, an aqueous saturated sodium hydrogen carbonate solution and saturated brine, dried over sodium sulfate, filtered, and then concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane:ethyl acetate=2:1) to synthesize 873 mg (yield: 84%) of the title compound. Melting point: 176-177° C. (ethyl acetate-hexane). [α]D20=+6.2° (c=0.53, chloroform).

Workup

  1. additionThe reaction solution was added to ice
  2. customthe organic layer was separated
  3. extractionthe aqueous layer was extracted with ethyl acetate
  4. washThe combined organic layers were washed with water
  5. dry with materialan aqueous saturated sodium hydrogen carbonate solution and saturated brine, dried over sodium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. customThe obtained residue was purified by silica gel column chromatography (hexane:ethyl acetate=2:1)

Sources & evidence

ORD record
ord-d703721fb8bf4a8990114f0c8463ad78
Source dataset
uspto-grants-2009_03
Patent number
US07507841B2

Reaction notes

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