Pyridine → 2-[2-(4-Fluorophenyl)acetyl]-4-(4-nitro-phenoxycarbonyloxy)-pyrazolidine-1-carboxylic acid benzyl ester

HRID 22688

반응식

HRID 22688 반응식
[CH2:1]([O:8][C:9]([N:11]1[CH2:15][CH:14]([OH:16])[CH2:13][N:12]1[C:17](=[O:26])[CH2:18][C:19]1[CH:24]=[CH:23][C:22]([F:25])=[CH:21][CH:20]=1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl[C:28]([O:30][C:31]1[CH:36]=[CH:35][C:34]([N+:37]([O-:39])=[O:38])=[CH:33][CH:32]=1)=[O:29].N1C=CC=CC=1>ClCCl.O>[CH2:1]([O:8][C:9]([N:11]1[CH2:15][CH:14]([O:16][C:28]([O:30][C:31]2[CH:32]=[CH:33][C:34]([N+:37]([O-:39])=[O:38])=[CH:35][CH:36]=2)=[O:29])[CH2:13][N:12]1[C:17](=[O:26])[CH2:18][C:19]1[CH:24]=[CH:23][C:22]([F:25])=[CH:21][CH:20]=1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

참가 물질

6

반응물 3

HCID 1049PyridineHCID 821294-Nitrophenyl chloroformateHCID 207247442-[2-(4-Fluorophenyl)acetyl]-4-hydroxypyrazolidine-1-carboxylic acid benzyl ester

생성물 1

HCID 207247432-[2-(4-Fluorophenyl)acetyl]-4-(4-nitro-phenoxycarbonyloxy)-pyrazolidine-1-carboxylic acid benzyl ester수율 86%

시약·촉매·용매 2

HCID 962Water용매HCID 6344Dichloromethane용매

반응 조건

온도
0 °C

실험 절차

2-[2-(4-Fluorophenyl)acetyl]-4-hydroxy-pyrazolidine-1-carboxylic acid benzyl ester, 38, (366 mg, 1.02 mmol) is dissolved in dichloromethane (10 mL). The solution is cooled to 0° C. and p-nitrophenyl chloroformate (411 mg, 2.04 mmol) is added in one portion. The solution is stirred at 0° C., and pyridine (198 μL, 2.45 mmol) added. Stirring is continued at 0° C. for 1 hour followed by stirring at room temperature for 12 hours. The reaction is diluted with water (40 mL) and extracted with dichloromethane (40 mL). The organic layer is washed with 0.5 N NaOH (2×40 mL). The combined aqueous layers are back-extracted extracted with dichloromethane (30 mL). The combined organic layers are washed with brine (30 mL), dried, filtered, and concentrated in vacuo. The crude material is purified over silica (3:1 to 2:1 to 1:1 hexane/ethyl acetate) to afford 462 mg (86% yield) of the desired product as a white foam.

후처리

  1. stirringStirring
  2. stirringby stirring at room temperature for 12 hours
  3. extractionextracted with dichloromethane (40 mL)
  4. washThe organic layer is washed with 0.5 N NaOH (2×40 mL)
  5. extractionThe combined aqueous layers are back-extracted
  6. extractionextracted with dichloromethane (30 mL)
  7. washThe combined organic layers are washed with brine (30 mL)
  8. customdried
  9. filtrationfiltered
  10. concentrationconcentrated in vacuo
  11. customThe crude material is purified over silica (3:1 to 2:1 to 1:1 hexane/ethyl acetate)

출처 및 근거

ORD 기록
ord-230ad8afcb884784baa19701dbf60b48
출처 데이터셋
uspto-grants-2005_02
특허 번호
US06849627B2

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