Reacción #1880953

Ecuación de reacción

4-hydroxy-2-trifluoromethylthiophene

2,6-difluoropyridine

DMF

K2CO3

→

2-fluoro-6-(2-trifluoromethyl-4-thienyloxy)pyridine

Rendimiento 74.3%

Disolventes

water

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturacooled to RT
2. 2
   ExtracciónAfter extraction twice with heptane/ethyl acetate (1:1)
3. 3
   Lavadotwice with ethyl acetate the product is washed with water and saturated sodium chloride solution
4. 4
   Secadodried over MgSO4
5. 5
   Concentraciónconcentrated
6. 6
   OtroChromatographic purification on silica gel with heptane/ethyl acetate (3:7) as eluent

Procedimiento

1.00 g of 2,6-difluoropyridine is introduced into 10 ml of DMF under nitrogen and 1.44 g of K2CO3 are added at RT. 1.61 g of 4-hydroxy-2-trifluoromethylthiophene are added and the mixture is heated at 80° C. for 4 h, then cooled to RT and poured into water. After extraction twice with heptane/ethyl acetate (1:1) and twice with ethyl acetate the product is washed with water and saturated sodium chloride solution, dried over MgSO4 and concentrated. Chromatographic purification on silica gel with heptane/ethyl acetate (3:7) as eluent gives 1.7 g of 2-fluoro-6-(2-trifluoromethyl-4-thienyloxy)pyridine as a colorless oil.

Fuente