Carbon Dioxide → 4-Cyclopropylaminocarbonyl-2-isopropyloxazole-5-carboxylic acid

HRID 5332

반응식

HRID 5332 반응식
C([Li])CCC.[CH:6]1([NH:9][C:10]([C:12]2[N:13]=[C:14]([CH:17]([CH3:19])[CH3:18])[O:15][CH:16]=2)=[O:11])[CH2:8][CH2:7]1.[C:20](=[O:22])=[O:21]>CCCCCC.O1CCCC1>[CH:6]1([NH:9][C:10]([C:12]2[N:13]=[C:14]([CH:17]([CH3:19])[CH3:18])[O:15][C:16]=2[C:20]([OH:22])=[O:21])=[O:11])[CH2:7][CH2:8]1

참가 물질

6

반응물 3

HCID 280Carbon DioxideHCID 156724292-Isopropyl-oxazole-4-carboxylic acid-cyclopropylamideHCID 178418339Butyllithium

생성물 1

HCID 156724304-Cyclopropylaminocarbonyl-2-isopropyloxazole-5-carboxylic acid수율 81%

시약·촉매·용매 2

HCID 8028Tetrahydrofuran용매HCID 8058Hexane용매

실험 절차

At -70° C. and under a nitrogen blanket, 0.12 mol of n-butyllithium (80.0 ml of a 1.5 molar solution in hexane) was dripped into a solution of 10.4 g (0.054 mol) of 2-isopropyloxazole-4-carboxylic acid-cyclopropylamide in 250 ml of tetrahydrofuran, and the mixture was stirred for 30 minutes at this temperature. The reaction mixture was then poured onto 500 g of solid CO2 and allowed to stand overnight. The residue remaining after evaporating down was taken up in 200 ml of water and 30 ml of 2N NaOH, the solution was extracted twice, each time with 100 ml of diethyl ether, the aqueous phase was acidified to a pH of 2 with concentrated hydrochloric acid and the solution extracted three times, each time with 200 ml of ethyl acetate. Drying over magnesium sulfate and removal of the solvent under reduced pressure gave 10.4 g (81%) of 4-cyclopropylaminocarbonyl-2-isopropyloxazole-5-carboxylic acid as a white powder of m.p. 109°-112° C. (active ingredient no. 3.007).

후처리

  1. customAt -70° C.
  2. waitto stand overnight
  3. customafter evaporating down
  4. extraction30 ml of 2N NaOH, the solution was extracted twice
  5. extractionthe solution extracted three times
  6. dry with materialDrying over magnesium sulfate and removal of the solvent under reduced pressure

출처 및 근거

ORD 기록
ord-6db241b1de6942798489126e4163fdde
출처 데이터셋
uspto-grants-1993_09
특허 번호
US05244867

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