Nitric Acid → 3-Methoxy-4-nitro-1-oxo-1lambda~5~-pyridine

HRID 266913

반응식

HRID 266913 반응식
[CH3:1][O:2][C:3]1[CH:4]=[N+:5]([O-:9])[CH:6]=[CH:7][CH:8]=1.OS(O)(=O)=O.[N+:15]([O-])([OH:17])=[O:16].[OH-].[Na+]>>[CH3:1][O:2][C:3]1[CH:4]=[N+:5]([O-:9])[CH:6]=[CH:7][C:8]=1[N+:15]([O-:17])=[O:16]

참가 물질

5

반응물 4

HCID 944Nitric AcidHCID 1118Sulfuric AcidHCID 14798Sodium HydroxideHCID 139850Pyridine, 3-methoxy-, 1-oxide

생성물 1

HCID 147627103-Methoxy-4-nitro-1-oxo-1lambda~5~-pyridine수율 41%

반응 조건

온도
75 °C

실험 절차

A solution of 3-methoxypyridine-N-oxide (24 g, 0.19 mol) and con. H2SO4 (45 ml)was carefully prepared by adding the acid slowly to the solid N-oxide using an ice bath for cooling. After solution is effected, it is rapidly stirred and fuming nitric acid (45 ml) is added over 15 min. The reaction mixture was warmed to 75° C. for 2.5 hours. The contents were poured onto ice and neutralized to pH 9 with cooling using 50% NaOH. The mixture was extracted three times with CH2Cl2, dried, (Na2SO4) and solvent evaporated under reduced pressure to produce an oil. The crude product was chromatographed on silica gel using CH2Cl2 /MeOH (99:1) as the eluent to give 17.5 g (41%) of the pure product as a crystalline solid, m.p. 125°-127° C. The structural assignment is supported by the proton NMR spectrum.

후처리

  1. temperaturefor cooling
  2. additionThe contents were poured onto ice and neutralized to pH 9
  3. temperaturewith cooling
  4. extractionThe mixture was extracted three times with CH2Cl2
  5. customdried
  6. custom(Na2SO4) and solvent evaporated under reduced pressure
  7. customto produce an oil
  8. customThe crude product was chromatographed on silica gel

출처 및 근거

ORD 기록
ord-7c8328e039e743a59011498e4f254e9c
출처 데이터셋
uspto-grants-1997_07
특허 번호
US05652363

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