Sulfuric Acid → 3-(4-Methylphenyl)-5-butyrylisoxazole

HRID 1440331

反応式

HRID 1440331 の反応式
[H-].[Na+].C(C(C(OC1C=CC=CO1)=O)C(OC1C=CC=CO1)=O)C.[CH2:24]([CH:26]([C:30]([OH:32])=O)C(O)=O)[CH3:25].O1C=CCCC1.S(=O)(=O)(O)O.C(C(C([O-])=O)C([O-])=O)C.C(OC1C=CC=CO1)(=O)CC(OC1C=CC=CO1)=O.[Na].[CH3:73][C:74]1[CH:79]=[CH:78][C:77]([C:80]2[CH:84]=[C:83](C(Cl)=O)[O:82][N:81]=2)=[CH:76][CH:75]=1>C1C=CC=CC=1.O.C(O)(=O)C.O1CCCC1>[CH3:73][C:74]1[CH:75]=[CH:76][C:77]([C:80]2[CH:84]=[C:83]([C:30](=[O:32])[CH2:26][CH2:24][CH3:25])[O:82][N:81]=2)=[CH:78][CH:79]=1

参加物

13

反応物 8

HCID 1118Sulfuric AcidHCID 80803,4-dihydro-2H-pyranHCID 11756Ethylmalonic acidHCID 24758Sodium hydrideHCID 6950106EthylpropanedioateHCID 19976934Dipyranyl ethylmalonateHCID 537159153-(4-Methylphenyl)isoxazole-5-carboxylic acid chlorideHCID 67715643Sodium dipyranyl malonate

生成物 1

HCID 199769533-(4-Methylphenyl)-5-butyrylisoxazole

試薬・触媒・溶媒 4

HCID 176Acetic Acid溶媒HCID 241Benzene溶媒HCID 962Water溶媒HCID 8028Tetrahydrofuran溶媒

実験手順

In 50 ml of benzene, 2.6 g (57.5 mmol) of 60% sodium hydride were added to dipyranyl ethylmalonate which had been prepared from 5.7 g (43.2 mmol) of ethylmalonic acid, 9.0 g (107.1 mmol) of 3,4-dihydropyran and 1 droplet of concentrated sulfuric acid. At 40°-50° C., the ethylmalonate was converted to sodium dipyranyl malonate, to which a tetrahydrofuran solution of 3-(4-methylphenyl)isoxazole-5-carboxylic acid chloride synthesized above in the procedure (3) was added dropwise at room temperature. They were reacted for 3 hours. The reaction mixture was added with 10 ml of acetic acid and then heated under reflux for 6 hours. The mixture thus obtained was added into water and then extracted with benzene. The benzene extract was washed successively with an aqueous solution of sodium hydrogencarbonate and water. The organic layer was dried over anhydrous sodium sulfate and the solvent was distilled off. Hexane was added to the residue, and 3-(4-methylphenyl)-5-butyrylisoxazole precipitated as crystals was collected by filtration.

後処理

  1. customAt 40°-50° C.
  2. customsynthesized above in the procedure (3)
  3. additionwas added dropwise at room temperature
  4. customThey were reacted for 3 hours
  5. temperatureheated
  6. temperatureunder reflux for 6 hours
  7. customThe mixture thus obtained
  8. extractionextracted with benzene
  9. extractionThe benzene extract
  10. washwas washed successively with an aqueous solution of sodium hydrogencarbonate and water
  11. dry with materialThe organic layer was dried over anhydrous sodium sulfate
  12. distillationthe solvent was distilled off
  13. additionHexane was added to the residue, and 3-(4-methylphenyl)-5-butyrylisoxazole
  14. customprecipitated as crystals
  15. filtrationwas collected by filtration

出典と根拠

ORDレコード
ord-373eee14e52f4e4fbf79c7abb5aecdde
出典データセット
uspto-grants-1996_03
特許番号
US05498619

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