反应详情

124.8 g. (0.44 moles) of the 3-(2-thienylmethyl)-5-(trichloromethyl)-1,2,4-oxadiazole obtained in part (a) are dissolved in 100 ml. of ether and added dropwise to 200 ml. of liquid ammonia at -45° with stirring. This mixture is stirred for one more hour and then the ammonia and solvent are permitted to evaporate overnight. The solid residue is treated with water and filtered under suction. 75 g. of crude 5-amino-3-(2-thienylmethyl)-1,2,4-oxadiazole are obtained which is recrystallized from isopropanol, yield 52.5 g., m.p. 132°-133°.

1. dissolutionare dissolved in 100 ml
2. customto evaporate overnight
3. additionThe solid residue is treated with water
4. filtrationfiltered under suction