Methanol → 6-(Difluoromethyl)-4-ethyl-2-(trifluoromethyl)-3,5-pyridinedicarboxylic acid

HRID 847456노트

반응식

HRID 847456 반응식
[F:1][CH:2]([F:25])[C:3]1[C:8]([C:9]([O:11]CC)=[O:10])=[C:7]([CH2:14][CH3:15])[C:6]([C:16]([O:18]CC)=[O:17])=[C:5]([C:21]([F:24])([F:23])[F:22])[N:4]=1.CO.[OH-].[K+]>O>[F:25][CH:2]([F:1])[C:3]1[N:4]=[C:5]([C:21]([F:24])([F:22])[F:23])[C:6]([C:16]([OH:18])=[O:17])=[C:7]([CH2:14][CH3:15])[C:8]=1[C:9]([OH:11])=[O:10]

참가 물질

5

반응물 3

HCID 887MethanolHCID 14797Potassium Hydroxide2회HCID 13957657Diethyl 2-(difluoromethyl)-4-ethyl-6-(trifluoromethyl)-3,5-pyridinedicarboxylate

생성물 1

HCID 139576946-(Difluoromethyl)-4-ethyl-2-(trifluoromethyl)-3,5-pyridinedicarboxylic acid수율 52.3%

시약·촉매·용매 1

HCID 962Water용매

실험 절차

A 1-liter flask is charged with 60 g (0.163 mole) of the product of Example 12 and 200 ml of methyl alcohol. In another flask, 150 ml of water and 21.52 g (0.326 mole) of potassium hydroxide are combined. The aqueous KOH is poured into the 1-liter flask and the mixture is heated to reflux overnight. The reaction mixture is cooled and extracted once with ethyl ether. The aqueous layer is acidified with concentrated hydrochloric acid and extracted with ethyl ether. The organics are dried on anhydrous magnesium sulfate, filtered, and concentrated to yield 26.72 g (52%) of the desired product, m.p. 237°-239° C.

후처리

  1. temperaturethe mixture is heated
  2. temperatureto reflux overnight
  3. temperatureThe reaction mixture is cooled
  4. extractionextracted once with ethyl ether
  5. extractionextracted with ethyl ether
  6. dry with materialThe organics are dried on anhydrous magnesium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated

출처 및 근거

ORD 기록
ord-21257518eb1b4174a981efbf51a874bf
출처 데이터셋
uspto-grants-1992_08
특허 번호
US05142055

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