Hydrochloric Acid → Isobutyl (S)-chroman-2-carboxylate

HRID 2257486

反応式

HRID 2257486 の反応式
Cl.[O:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH2:5][CH2:4][C@H:3]1[C:12]([OH:14])=[O:13]>>[O:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[CH2:5][CH2:4][C@H:3]1[C:12]([O:14][CH2:5][CH:6]([CH3:11])[CH3:7])=[O:13]

参加物

3

反応物 2

HCID 313Hydrochloric AcidHCID 6933105(2S)-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid

生成物 1

HCID 54151958Isobutyl (S)-chroman-2-carboxylate

実験手順

The aqueous phase of the hydrolysis reaction was acidified to pH of 2.0 with conc. HCl forming a white precipitate of (S)-chroman-2-carboxylic acid. The S-acid was extracted into toluene, and the phases were separated. The organic layer was placed in a vessel suitable for acid catalyzed esterification. Sulfuric acid was added to the vessel, and the mixture was heated to reflux. Water was removed by azeotropic distillation. The conversion of the acid to the ester was followed by GC analysis. Isobutyl (S)-chroman-2-carboxylate was thereby formed. Upon completion of the esterification, the sulfuric acid catalyst used in the reaction was removed by washing the reaction product with saturated sodium carbonate, and the S-carboxylate product was azeotropically dried again.

後処理

  1. customThe aqueous phase of the hydrolysis reaction
  2. extractionThe S-acid was extracted into toluene
  3. customthe phases were separated
  4. customThe organic layer was placed in a vessel suitable for acid
  5. additionSulfuric acid was added to the vessel
  6. temperaturethe mixture was heated to reflux
  7. customWater was removed by azeotropic distillation

出典と根拠

ORDレコード
ord-509626b07857430d8702245ebee2df6d
出典データセット
uspto-grants-1997_08
特許番号
US05658796

関連ノート

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