Reacción #56104

Ecuación de reacción

water

4-cyano-3,4-diphenylbutyryl chloride

2-butyn-1,4-diol

pyridine

→

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

Disolventes

benzene

THF

Condiciones de reacción

Tratamiento posterior

1. 1
   Otroequipped with a Drierite tube
2. 2
   Otrothe layers were separated
3. 3
   ExtracciónTwo 60-ml ether extractions of the aqueous layer
4. 4
   Lavadowere washed twice with 100 ml of H2O, with 100 ml saturated aqueous sodium bicarbonate
5. 5
   workup.STIRRINGwith 100 ml saturated aqueous sodium chloride and were stirred over MgSO4
6. 6
   Otropurified by column chromatography on silica gel (hexanes/methylene chloride)
7. 7
   Otroto give two fractions

Procedimiento

A solution of 10.7 g (0.038 mol) of 4-cyano-3,4-diphenylbutyryl chloride in 30 ml of benzene was added over a 45 minute period to a stirred solution of 6.5 g (0.076 mol) of 2-butyn-1,4-diol and 3.4 ml of pyridine in 100 ml of THF at 0°. The reaction mixture was stirred for 24 hours at room temperature in a flask equipped with a Drierite tube. The solution was poured into 50 ml of water and the layers were separated. Two 60-ml ether extractions of the aqueous layer were combined with the THF layer, were washed twice with 100 ml of H2O, with 100 ml saturated aqueous sodium bicarbonate, and with 100 ml saturated aqueous sodium chloride and were stirred over MgSO4. The filtered solution was stripped and purified by column chromatography on silica gel (hexanes/methylene chloride) to give two fractions weighing 12.6 g (47%) having different isomer ratios as determined from the nmr spectra. The infrared and nmr spectra are in accord with the assigned structure.

Fuente