Hydrochloric Acid → 5-Cyano-2-[2-(4-methoxyphenyl)ethyl]-3-benzofurancarboxylic acid

HRID 53968Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 53968
[OH-:1].[Na+].BrBr.[C:5]([C:8]1[C:12]2[CH:13]=[C:14]([C:17]#[N:18])[CH:15]=[CH:16][C:11]=2[O:10][C:9]=1[CH2:19][CH2:20][C:21]1[CH:26]=[CH:25][C:24]([O:27][CH3:28])=[CH:23][CH:22]=1)(=[O:7])C.Cl>O.O1CCOCC1>[C:17]([C:14]1[CH:15]=[CH:16][C:11]2[O:10][C:9]([CH2:19][CH2:20][C:21]3[CH:22]=[CH:23][C:24]([O:27][CH3:28])=[CH:25][CH:26]=3)=[C:8]([C:5]([OH:1])=[O:7])[C:12]=2[CH:13]=1)#[N:18]

Komponenten

7

Edukt 4

HCID 313Hydrochloric AcidHCID 14798Sodium HydroxideHCID 24408BromineHCID 218444313-Acetyl-2-[2-(4-methoxyphenyl)ethyl]-5-benzofurancarbonitrile

Produkt 1

HCID 218443945-Cyano-2-[2-(4-methoxyphenyl)ethyl]-3-benzofurancarboxylic acidAusbeute 34,6 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 962WaterLösungsmittel2×HCID 312751,4-DioxaneLösungsmittel

Versuchsvorschrift

5.2 g of sodiumhydroxide was dissolved in 30 ml of water, and the solution was cooled to a temperature of 0° C. or below. With stirring, to this were added dropwise 2.7 ml of bromine and then 40 ml of a dioxane solution containing 4.14 g of 3-acetyl-2-[2-(4-methoxyphenyl)ethyl]-5-benzofurancarbonitrile obtained in the above step d). The resulting mixture was stirred at 0° C. for 45 minutes with ice cooling for 1 hour. The resulting reaction solution was mixed with water, adjusted to pH 2 with concentrated hydrochloric acid, and then extracted with chloroform. The resulting organic layer was washed with water and dried to distill off the solvent. Thereafter, the resulting residue was purified by subjecting it to silica gel column chromatography using chloroform as an eluant, thereby obtaining 1.44 g of 5-cyano-2-[2-(4-methoxyphenyl)ethyl]-3-benzofurancarboxylic acid.

Aufarbeitung

  1. temperaturethe solution was cooled to a temperature of 0° C. or below
  2. customobtained in the above step d)
  3. stirringThe resulting mixture was stirred at 0° C. for 45 minutes with ice cooling for 1 hour
  4. customThe resulting reaction solution
  5. extractionextracted with chloroform
  6. washThe resulting organic layer was washed with water
  7. customdried
  8. distillationto distill off the solvent
  9. customThereafter, the resulting residue was purified

Quellen und Nachweise

ORD-Eintrag
ord-760acea9f09f4125a5e816086c5487cb
Quelldatensatz
uspto-grants-1997_04
Patentnummer
US05620991

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