Benzofuran → 4-(2-Benzofuranyl)-1,3-dimethyl-4-piperidinol

HRID 2057423노트

반응식

HRID 2057423 반응식
C([Li])CCC.[O:6]1[C:10]2[CH:11]=[CH:12][CH:13]=[CH:14][C:9]=2[CH:8]=[CH:7]1.[CH3:15][N:16]1[CH2:21][CH2:20][C:19](=[O:22])[CH:18]([CH3:23])[CH2:17]1>CCCCCC.C(OCC)C>[O:6]1[C:10]2[CH:11]=[CH:12][CH:13]=[CH:14][C:9]=2[CH:8]=[C:7]1[C:19]1([OH:22])[CH2:20][CH2:21][N:16]([CH3:15])[CH2:17][CH:18]1[CH3:23]

참가 물질

6

반응물 3

HCID 9223BenzofuranHCID 1073111,3-Dimethyl-4-piperidoneHCID 178418339Butyllithium

생성물 1

HCID 233122544-(2-Benzofuranyl)-1,3-dimethyl-4-piperidinol

시약·촉매·용매 2

HCID 3283Diethyl Ether용매2회HCID 8058Hexane용매

실험 절차

50 ml of a bimolar solution of n-butyl lithium in hexane is added dropwise within 30 minutes, at a reaction temperature of -5°, to a solution of 11.8 g of benzofuran in 100 ml of diethyl ether. The solution is then stirred for a further hour at 0°. There is thereupon made within 15 minutes a dropwise addition of a solution of 1,3-dimethyl-4-piperidone in 50 ml of abs. diethyl ether. The reaction temperature is maintained at 0° by external cooling. The reaction solution is subsequently stirred for a further 15 hours at room temperature. It is then poured, with stirring, onto 200 g of ice, and the aqueous phase extracted three times with 500 ml of ethyl acetate each time. The combined organic extracts are dried over sodium sulphate, filtered, and concentrated by evaporation. The residue is dissolved in 500 ml of 2 N hydrochloric acid and the acid solution washed with ether. The aqueous solution is thereupon adjusted by addition of 10% sodium hydroxide solution to pH 12, and extracted with 1 liter of chloroform. The chloroform solution is dried with sodium sulphate, filtered off under suction, and concentrated by evaporation to obtain 4-(2-benzofuranyl)-1,3-dimethyl-4-piperidinol, which melts at 128°-130° after recrystallisation from hexane.

후처리

  1. temperatureThe reaction temperature is maintained at 0° by external cooling
  2. stirringThe reaction solution is subsequently stirred for a further 15 hours at room temperature
  3. additionIt is then poured
  4. extractionthe aqueous phase extracted three times with 500 ml of ethyl acetate each time
  5. dry with materialThe combined organic extracts are dried over sodium sulphate
  6. filtrationfiltered
  7. concentrationconcentrated by evaporation
  8. dissolutionThe residue is dissolved in 500 ml of 2 N hydrochloric acid
  9. washthe acid solution washed with ether
  10. additionThe aqueous solution is thereupon adjusted by addition of 10% sodium hydroxide solution to pH 12
  11. extractionextracted with 1 liter of chloroform
  12. dry with materialThe chloroform solution is dried with sodium sulphate
  13. filtrationfiltered off under suction
  14. concentrationconcentrated by evaporation

출처 및 근거

ORD 기록
ord-dc670d9ef09f458ca953048efd7afda1
출처 데이터셋
uspto-grants-1980_07
특허 번호
US04210655

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