Sodium Hydroxide → 5-ethyl-1-methyl-1H-pyrazole-3-carboxylic acid

HRID 1452104노트

반응식

HRID 1452104 반응식
[CH2:1]([C:3]1[N:7]([CH3:8])[N:6]=[C:5]([C:9]([O:11]CC)=[O:10])[CH:4]=1)[CH3:2].[OH-].[Na+]>C(O)C.O>[CH2:1]([C:3]1[N:7]([CH3:8])[N:6]=[C:5]([C:9]([OH:11])=[O:10])[CH:4]=1)[CH3:2]

참가 물질

5

반응물 2

HCID 14798Sodium HydroxideHCID 22145397Ethyl 5-ethyl-1-methyl-1H-pyrazole-3-carboxylate

생성물 1

HCID 199675945-ethyl-1-methyl-1H-pyrazole-3-carboxylic acid수율 47%

시약·촉매·용매 2

HCID 702Ethanol용매HCID 962Water용매

실험 절차

Ethyl 5-ethyl-1-methylpyrazole-3-carboxylate (6.86 g) in ethanol (70 ml) was treated with sodium hydroxide (1.58g) in water (30 ml) and heated under reflux for 6 h. The solution was concentrated and the aqueous phase washed with ethyl acetate before adding dichloromethane (50 ml). The solution was acidified with 5M hydrochloric acid, and the mixture exhaustively extracted with dichloromethane. The remaining undissolved solid was filtered off suspended in water and the pH adjusted to 6 with saturated sodium hydrogen carbonate. The solution was again extracted with dichloromethane. The combined organic layers were dried over anhydrous magnesium sulphate and concentrated to give the title compound as a white solid, (2.72g, 47%); (Found: M+, 154.0742. C7H10N2O2 requires M, 154.0742); nmax (CH2Cl2) 3689 and 1760 cm-1 ; dH (CDCl3) 1.30 (3H, t, J7.4 Hz), 2.64 (2H, q, J7.4 Hz), 3.88 (3H, s) and 6.65 (1H, s).

후처리

  1. temperatureheated
  2. temperatureunder reflux for 6 h
  3. concentrationThe solution was concentrated
  4. washthe aqueous phase washed with ethyl acetate
  5. additionbefore adding dichloromethane (50 ml)
  6. extractionthe mixture exhaustively extracted with dichloromethane
  7. filtrationThe remaining undissolved solid was filtered off
  8. extractionThe solution was again extracted with dichloromethane
  9. dry with materialThe combined organic layers were dried over anhydrous magnesium sulphate
  10. concentrationconcentrated

출처 및 근거

ORD 기록
ord-7cc63069e0ce4353ad26c2b45e90da4f
출처 데이터셋
uspto-grants-1997_02
특허 번호
US05606051

반응 노트

불러오는 중…