反応 #2358490

反応方程式

oxalyl chloride

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

→

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

収率 74.1%

溶媒

ethanol

反応条件

後処理

1. 1
   温度cooling
2. 2
   温度under reflux
3. 3
   濃縮concentrated under reduced pressure
4. 4
   workup.ADDITIONTo the residue was added chloroform
5. 5
   洗浄the organic layer was washed with saturated aqueous sodium bicarbonate solution and saturated aqueous sodium chloride solution
6. 6
   乾燥dried over magnesium sulfate
7. 7
   濃縮concentrated under reduced pressure

実験手順

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).

出典