Reaktion #50814

Reaktionsgleichung

peracetic acid

2-(p-ethoxycarbonylphenyl)pyridine

→

2-(p-ethoxycarbonylphenyl)pyridine-N-oxide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturto maintain the reaction temperature between 80° and 85°
2. 2
   workup.ADDITIONAfter the addition
3. 3
   Temperaturis heated at 90° for 3 h
4. 4
   SonstigeThe excess peracetic acid is destroyed with aqueous sodium sulfite solution
5. 5
   SonstigeThe solvent is evaporated
6. 6
   SonstigeEvaporation

Vorschrift

8.9 ml of 40% peracetic acid is added dropwise to 14.08 g of 2-(p-ethoxycarbonylphenyl)pyridine so as to maintain the reaction temperature between 80° and 85°. After the addition is complete the reaction mixture is heated at 90° for 3 h, and allowed to cool to room temperature. The excess peracetic acid is destroyed with aqueous sodium sulfite solution. The solvent is evaporated and the residue taken up in methylene chloride and refiltered through Celite®. Evaporation yields 2-(p-ethoxycarbonylphenyl)pyridine-N-oxide which is treated with 8.66 g dimethyl sulfate in 62 ml of toluene at 90° for 3 h. The solvent is evaporated and the residue redissolved in an ice-cold mixture of 8 ml of water and 9.3 ml of 1N sodium hydroxide. A solution of 13.64 g of potassium cyanide in 10 ml of water is added slowly and the reaction mixture is maintained at 0° for 24 h. Extraction with methylene chloride, drying over sodium sulfate and evaporation of solvent yields the title compound a); IR (CH2Cl2) 2200 cm-1.

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