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Hydrogen Peroxide → 2-(2',4'-Dichloro-4-ethylbiphenyl-3-yl)-4,4,6,6-tetramethyl-1,5-dioxaspiro[2.4]heptan-7-one

HRID 879084
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HRID 879084 반응식
[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[CH:14]=[CH:13][C:12]([CH2:15][CH3:16])=[C:11]([CH:17]=[C:18]2[C:22]([CH3:24])([CH3:23])[O:21][C:20]([CH3:26])([CH3:25])[C:19]2=[O:27])[CH:10]=1.[OH:28]O.[OH-].[Li+]>CO>[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[CH:14]=[CH:13][C:12]([CH2:15][CH3:16])=[C:11]([CH:17]2[C:18]3([C:19](=[O:27])[C:20]([CH3:26])([CH3:25])[O:21][C:22]3([CH3:24])[CH3:23])[O:28]2)[CH:10]=1
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참가 물질

5

반응물 3

HCID 784Hydrogen PeroxideHCID 3939Lithium HydroxideHCID 668237254-[1-(2',4'-Dichloro-4-ethylbiphenyl-3-yl)-methylidene]-2,2,5,5-tetramethyldihydrofuran-3-one

생성물 1

HCID 866636752-(2',4'-Dichloro-4-ethylbiphenyl-3-yl)-4,4,6,6-tetramethyl-1,5-dioxaspiro[2.4]heptan-7-one

시약·촉매·용매 1

HCID 887Methanol용매

실험 절차

To a solution of 4-[1-(2′,4′-dichloro-4-ethylbiphenyl-3-yl)-methylidene]-2,2,5,5-tetramethyldihydrofuran-3-one (2.04 g, 0.0051 mol) in methanol (24 ml) at 55° C. is added hydrogen peroxide solution (0.43 ml, 0.0076 mmol, 50% wt solution), followed immediately by aqueous lithium hydroxide (0.25 ml, 0.0005 mol). The reaction mixture is heated at this temperature for 30 minutes, then is rapidly cooled to room temperature and quenched with saturated sodium thiosulphate. The crude product is extracted with diethyl ether (×3), washed with saturated sodium bicarbonate, then dried over magnesium sulfate. The residue is purified by flash column chromatography (5% ethyl acetate in isohexane to 25% ethyl acetate in isohexane) to afford 2-(2′,4′-dichloro-4-ethylbiphenyl-3-yl)-4,4,6,6-tetramethyl-1,5-dioxaspiro[2.4]heptan-7-one as a yellow gum.

후처리

  1. temperatureThe reaction mixture is heated at this temperature for 30 minutes
  2. customquenched with saturated sodium thiosulphate
  3. extractionThe crude product is extracted with diethyl ether (×3)
  4. washwashed with saturated sodium bicarbonate
  5. dry with materialdried over magnesium sulfate
  6. customThe residue is purified by flash column chromatography (5% ethyl acetate in isohexane to 25% ethyl acetate in isohexane)

출처 및 근거

ORD 기록
ord-0daf34bf6abe4f019db0cfc51ea847c7
출처 데이터셋
uspto-grants-2015_03
DOI
10.6084/m9.figshare.5104873.v1
특허 번호
US08987476B2

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