Water → 5-(3,5-dichloro-phenylsulphanyl)-1-ethyl-3-methyl-1H-pyrazol-4-yl-methanol

HRID 47631

Reaktionsgleichung

Reaktionsgleichung von HRID 47631
[Cl:1][C:2]1[CH:3]=[C:4]([S:9][C:10]2[N:14]([CH2:15][CH3:16])[N:13]=[C:12]([CH3:17])[C:11]=2[CH:18]=[O:19])[CH:5]=[C:6]([Cl:8])[CH:7]=1.[BH4-].[Na+].O>CO>[Cl:1][C:2]1[CH:3]=[C:4]([S:9][C:10]2[N:14]([CH2:15][CH3:16])[N:13]=[C:12]([CH3:17])[C:11]=2[CH2:18][OH:19])[CH:5]=[C:6]([Cl:8])[CH:7]=1

Komponenten

5

Edukt 3

HCID 962WaterHCID 4311764Sodium borohydrideHCID 227474955-(3,5-dichloro-phenylsulphanyl)-1-ethyl-3-methyl-1H-pyrazole-4-carbaldehyde

Produkt 1

HCID 227475205-(3,5-dichloro-phenylsulphanyl)-1-ethyl-3-methyl-1H-pyrazol-4-yl-methanolAusbeute 81,5 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 887MethanolLösungsmittel

Versuchsvorschrift

A mixture of 1.1 g of 5-(3,5-dichloro-phenylsulphanyl)-1-ethyl-3-methyl-1H-pyrazole-4-carbaldehyde and 0.53 g of sodium borohydride in 25 ml of anhydrous methanol was stirred under nitrogen at room temperature for 15 minutes. Water (25 ml) was added and the mixture was extracted three times with 20 ml of diethyl ether. The combined extracts were dried over magnesium sulphate, filtered and evaporated. The residue was purified by flash chromatography on silica gel using ethyl acetate/petroleum ether (bp 40-60° C.) (1:3) for the elution to give 902 mg of [5-(3,5-dichloro-phenylsulphanyl)-1-ethyl-3-methyl-1H-pyrazol-4-yl]-methanol as a yellow oil. Mass spectrum (ES) m/z 317 [M+H]+.

Aufarbeitung

  1. extractionthe mixture was extracted three times with 20 ml of diethyl ether
  2. dry with materialThe combined extracts were dried over magnesium sulphate
  3. filtrationfiltered
  4. customevaporated
  5. customThe residue was purified by flash chromatography on silica gel
  6. washfor the elution

Quellen und Nachweise

ORD-Eintrag
ord-e741a956356942d5bfb341537bb78c20
Quelldatensatz
uspto-grants-2004_03
Patentnummer
US06699887B2

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