Reacción #2358490

Ecuación de reacción

oxalyl chloride

5-(trifluoromethyl)benzo[b]thiophene-2-carboxylic acid

→

ethyl 5-(trifluoromethyl)benzo[b]thiophene-2-carboxylate

Rendimiento 74.1%

Disolventes

ethanol

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturacooling
2. 2
   Temperaturaunder reflux
3. 3
   Concentraciónconcentrated under reduced pressure
4. 4
   workup.ADDITIONTo the residue was added chloroform
5. 5
   Lavadothe organic layer was washed with saturated aqueous sodium bicarbonate solution and saturated aqueous sodium chloride solution
6. 6
   Secadodried over magnesium sulfate
7. 7
   Concentraciónconcentrated under reduced pressure

Procedimiento

Then, 254 mg of oxalyl chloride was added to a mixture of 400 mg of 5-(trifluoromethyl)benzo[b]thiophene-2-carboxylic acid and 20 ml of ethanol while ice-cooling, and the mixture was stirred for 6 hours under reflux. The reaction mixture was cooled to room temperature, and then concentrated under reduced pressure. To the residue was added chloroform, and then the organic layer was washed with saturated aqueous sodium bicarbonate solution and saturated aqueous sodium chloride solution, dried over magnesium sulfate, and then concentrated under reduced pressure to obtain 330 mg of ethyl 5-(trifluoromethyl)benzo[b]thiophene-2-carboxylate (the present compound 5).

Fuente