Bromobenzene → 4-(4-Bromophenyl)-2,2-dimethyl-4-oxo-butyric Acid

HRID 30831

反応式

HRID 30831 の反応式
[Br:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH3:8][C:9]1([CH3:16])[CH2:13][C:12](=[O:14])[O:11][C:10]1=[O:15].[Cl-].[Cl-].[Cl-].[Al+3]>ClC(Cl)C>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:12](=[O:14])[CH2:13][C:9]([CH3:16])([CH3:8])[C:10]([OH:15])=[O:11])=[CH:4][CH:3]=1

参加物

5

反応物 3

HCID 7961BromobenzeneHCID 870672,2-Dimethylsuccinic anhydrideHCID 6451240Aluminum(III) Chloride

生成物 1

HCID 219857574-(4-Bromophenyl)-2,2-dimethyl-4-oxo-butyric Acid収率 63%

試薬・触媒・溶媒 1

HCID 63651,1-Dichloroethane溶媒

実験手順

To a chilled solution (ice/water bath) of bromobenzene (7.71 g, 49.1 mmol) and 3,3-dimethyldihydro-2,5-furandione (5.99 g, 46.7 mmol) in dichloroethane (150 mL) was added aluminum trichloride (13.28 g, 99.58 mmol). The ice bath was removed and the reaction mixture was stirred at rt overnight. The mixture was again chilled in an ice/water bath, and then quenched with 1 M aqueous hydrochloric acid. Water (70 mL) was added and the layers were separated. The aqueous layer was extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by flash chromatography (Biotage apparatus, 17:83 ethyl acetate/hexane) to give 4-(4-bromophenyl)-2,2-dimethyl-4-oxobutanoic acid as a white solid (8.34 g, 63%). LC-MS: ret. time 2.79 min; m/z 284.8 (MH+); 1H NMR (300 MHz, CDCl3) δ 1.36 (s, 6H), 3.27 (s, 2H), 7.60 (d, 2H), 7.81 (d, 2H).

後処理

  1. customThe ice bath was removed
  2. temperatureThe mixture was again chilled in an ice/water bath
  3. customquenched with 1 M aqueous hydrochloric acid
  4. additionWater (70 mL) was added
  5. customthe layers were separated
  6. extractionThe aqueous layer was extracted with ethyl acetate (3×50 mL)
  7. dry with materialThe combined organic layers were dried over anhydrous magnesium sulfate
  8. concentrationconcentrated under reduced pressure
  9. customThe residue was purified by flash chromatography (Biotage apparatus, 17:83 ethyl acetate/hexane)

出典と根拠

ORDレコード
ord-c7b93df0ff2d4a47978180e5bed6eed4
出典データセット
uspto-grants-2008_09
特許番号
US07423156B2

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