Boron trifluoride → Ethyl 3-(4-nitrophenyl)-1,2,4-oxadiazole-5-carboxylate

HRID 54543

반응식

HRID 54543 반응식
[N+:1]([C:4]1[CH:13]=[CH:12][C:7]([C:8](=[N:10][OH:11])[NH2:9])=[CH:6][CH:5]=1)([O-:3])=[O:2].Cl[C:15](=O)[C:16]([O:18][CH2:19][CH3:20])=[O:17].B(F)(F)F>O1CCOCC1>[CH2:19]([O:18][C:16]([C:15]1[O:11][N:10]=[C:8]([C:7]2[CH:12]=[CH:13][C:4]([N+:1]([O-:3])=[O:2])=[CH:5][CH:6]=2)[N:9]=1)=[O:17])[CH3:20]

참가 물질

5

반응물 3

HCID 6356Boron trifluorideHCID 20884Ethoxalyl chlorideHCID 3825473N-Hydroxy-4-nitrobenzimidamide

생성물 1

HCID 2743197Ethyl 3-(4-nitrophenyl)-1,2,4-oxadiazole-5-carboxylate

시약·촉매·용매 1

HCID 312751,4-Dioxane용매

실험 절차

A mixture of 4-nitrobenzamide oxime (4 g) and ethyl chlorooxoacetate (3.01 g) in dioxane (200 ml) was refluxed for 1 hour, and then borontrifluoride (1 ml) was added thereto. The whole mixture was refluxed for 12 hours. After being cooled to room temperature, the solvent was evaporated in vacuo. The residue was diluted with ethyl acetate (100 ml), washed with a saturated potassium carbonate aqueous solution, dried over magnesium sulfate and evaporated in vacuo. The residue was purified by column chromatography on silica gel with a mixture of dichloromethane and hexane (1:1) as eluent. The fractions containing the object product were collected and evaporated in vacuo to afford 5-ethoxycarbonyl-3-(4-nitrophenyl)-1,2,4-oxadiazole.

후처리

  1. temperaturewas refluxed for 1 hour
  2. temperatureThe whole mixture was refluxed for 12 hours
  3. customthe solvent was evaporated in vacuo
  4. additionThe residue was diluted with ethyl acetate (100 ml)
  5. washwashed with a saturated potassium carbonate aqueous solution
  6. dry with materialdried over magnesium sulfate
  7. customevaporated in vacuo
  8. customThe residue was purified by column chromatography on silica gel with a mixture of dichloromethane and hexane (1:1) as eluent
  9. additionThe fractions containing the object product
  10. customwere collected
  11. customevaporated in vacuo

출처 및 근거

ORD 기록
ord-2cdff5b8567042a49776887cdc18c53d
출처 데이터셋
uspto-grants-1997_04
특허 번호
US05622976

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