Water → 1-(6-Hydroxy-3,4-dihydroisoquinolin-2(1H)-yl)ethan-1-one

HRID 597203노트

반응식

HRID 597203 반응식
Br.[OH:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[CH2:9][NH:8][CH2:7][CH2:6]2.[C:13]([O-])(=[O:15])[CH3:14].[Na+].C(OC(=O)C)(=O)C.O>C(Cl)Cl>[C:13]([N:8]1[CH2:7][CH2:6][C:5]2[C:10](=[CH:11][CH:12]=[C:3]([OH:2])[CH:4]=2)[CH2:9]1)(=[O:15])[CH3:14]

참가 물질

6

반응물 4

HCID 962WaterHCID 7918Acetic AnhydrideHCID 517045Sodium AcetateHCID 133617991,2,3,4-Tetrahydroisoquinolin-6-ol--hydrogen bromide (1/1)

생성물 1

HCID 133618081-(6-Hydroxy-3,4-dihydroisoquinolin-2(1H)-yl)ethan-1-one수율 90.9%

시약·촉매·용매 1

HCID 6344Dichloromethane용매

실험 절차

A mixture of 57.6 g of 1,2,3,4-tetrahydro-6-hydroxy-isoquinoline-hydrobromide, 22.6 g of anhydrous sodium acetate, and 76.6 g of acetic acid anhydride in 300 ml of methylene chloride is held at the boiling point for one hour under reflux. 300 ml of water are added thereto, the organic phase is separated, and the aqueous phase is extracted several times with methylene chloride. After evaporation of the methylene chloride extract, the residue is dissolved in dilute sodium hydroxide, stirred for 30 minutes on a boiling water bath, and the reaction product is precipitated by the introduction of carbon dioxide. The filtered substance is recrystallized from ethanol. 43.5 g of 2-acetyl-1,2,3,4-tetrahydro-6-hydroxy-isoquinoline are obtained. m.p. = 135° - 136° C. (ethanol - diisopropyl ether).

후처리

  1. temperatureunder reflux
  2. customthe organic phase is separated
  3. extractionthe aqueous phase is extracted several times with methylene chloride
  4. customAfter evaporation of the methylene chloride
  5. extractionextract
  6. dissolutionthe residue is dissolved in dilute sodium hydroxide
  7. customthe reaction product is precipitated by the introduction of carbon dioxide
  8. customThe filtered substance is recrystallized from ethanol

출처 및 근거

ORD 기록
ord-f69c45c9edc2416c9eb512d015633bd0
출처 데이터셋
uspto-grants-1977_03
특허 번호
US04013663

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