Reaktion #56105

Reaktionsgleichung

Thionyl chloride

4-hydroxy-2-butynyl 4-cyano-3,4-diphenylbutyrate

→

title compound

Ausbeute 25.0%

4-Chloro-2-butynyl 4-Cyano-3,4-diphenylbutyrate

Ausbeute 25.0%

Lösungsmittel

pyridine

ether

methylene chloride

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeequipped with a Drierite tube
2. 2
   Waschenwas washed sequentially with 40 ml of hydrochloric acid, 40 ml of saturated aqueous sodium bicarbonate, three 40-ml portions of water and 40 ml of saturated aqueous sodium chloride
3. 3
   TrocknenThe organic phase was dried (MgSO4)
4. 4
   Filtrationfiltered
5. 5
   Sonstigepurified by column chromatography on silica gel (hexanes/methylene chloride)

Vorschrift

Thionyl chloride (3.56 g, 30.0 mmol) was added via syringe over a 5 min period to a stirred solution of 8.00 g (24.0 mmol) of 4-hydroxy-2-butynyl 4-cyano-3,4-diphenylbutyrate in 2.4 ml of pyridine at 0°. The reaction mixture was stirred at room temperature for 2 hours in a flask equipped with a Drierite tube. The mixture was diluted with 40 ml of ether and 100 ml of methylene chloride and was washed sequentially with 40 ml of hydrochloric acid, 40 ml of saturated aqueous sodium bicarbonate, three 40-ml portions of water and 40 ml of saturated aqueous sodium chloride. The organic phase was dried (MgSO4), filtered, stripped and purified by column chromatography on silica gel (hexanes/methylene chloride) to yield 2.11 g (25%) of the title compound. The infrared and nmr spectra are in accord with the assigned structure.

Quelle