Dimethylcarbamoyl Chloride → 6-Acetylpicolinonitrile

HRID 2226825Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2226825
[C:1]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][N+:5]=1[O-])(=[O:3])[CH3:2].[CH3:11][N:12](C)C(Cl)=O.C([Si](C)(C)C)#N.C([O-])([O-])=O.[K+].[K+]>C(Cl)Cl>[C:1]([C:4]1[CH:9]=[CH:8][CH:7]=[C:6]([C:11]#[N:12])[N:5]=1)(=[O:3])[CH3:2]

Komponenten

6

Edukt 4

HCID 6598Dimethylcarbamoyl Chloride2×HCID 11430Potassium CarbonateHCID 82115Trimethylsilyl cyanide2×HCID 3379981-(1-Oxidopyridin-6-yl)ethanone

Produkt 1

HCID 152188056-Acetylpicolinonitrile

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

To a solution of 2-acetylpyridine-N-oxide (0.098 mol) in 200 ml of methylene chloride was added dimethylcarbamyl chloride (0.1 mol) and the reaction mixture was allowed to react at room temperature under nitrogen for 24 hours. Additional dimethylcarbamyl chloride (0.1 mol) was added followed by cyanotrimethylsilane (0.22 mol), and the resulting mixture was allowed to react at 20° C. for 2 days. An additional 4 ml (0.03 mol) of cyanotrimethylsilane was then added, and the mixture was stirred at room temperature for another 24 hours. A solution of 200 ml of 10% K2CO3 was added to the reaction mixture and the resulting mixture was stirred for 45 minutes. The aqueous layer was extracted with 100 ml methylene chloride twice, the organic layers were combined and dried (K2CO3). After stripping the solvent, 16.9 g of crude product was isolated. The crude product obtained was chromatographed over Florisil® to isolate the desired products and the by-products with elution by the series of solvents: 2-acetyl-6-cyanopyridine (3a) (2 g, 50% CH2Cl2 /hexane), 2-cyano-6-(1-cyano-1-trimethysilyloxy)ethylpyridine (3b) (0.81 g, CH2Cl2), 2-cyano-6-(1-cyano-1-dimethylcarbamoyloxy)ethylpyridine (3c) (1.67 g, 25:72 EtOAc/CH2Cl2), 2-(1-cyano-1-hydroxy)ethylpyridine (3d) (0.42 g, 50:50 EtOAc/CH2Cl2), and 2-(1-cyano-1-dimethylcarbamoyloxy)ethylpyridine-1-N-oxide ( 3e) (1.8 g, EtOAc). The products exhibited the following properties.

Aufarbeitung

  1. customto react at room temperature under nitrogen for 24 hours
  2. customto react at 20° C. for 2 days
  3. stirringthe resulting mixture was stirred for 45 minutes
  4. extractionThe aqueous layer was extracted with 100 ml methylene chloride twice
  5. dry with materialdried (K2CO3)
  6. custom16.9 g of crude product was isolated
  7. customThe crude product obtained
  8. customwas chromatographed over Florisil®

Quellen und Nachweise

ORD-Eintrag
ord-84e4f7ba5f934f9a81e3912742a59a9f
Quelldatensatz
uspto-grants-1994_09
Patentnummer
US05350696

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