反应详情

Benzoyl chloride (3.26 ml.) and 4N aqueous sodium hydroxide solution (8 ml.) were added alternately, in portions over 25 minutes, to a vigorously shaken, ice-cooled solution of 5-amino-4-carbamoyl-1H-1,2,3-triazole (1.27 g; prepared by the method of J. R. E. Hoover and A. R. Day, J. Amer. Chem. Soc., 1956, 78,5832) in 4N aqueous sodium hydroxide solution (15 ml.). The reaction mixture was extracted with diethyl ether, the aqueous layer cooled and acidified with concentrated hydrochloric acid, and the white precipitate filtered off and washed well with water. The crude solid was stirred in diethyl ether and then purified by dissolving in dilute aqueous sodium hydroxide solution, and reprecipitation by the addition of concentrated hydrochloric acid. The solid was filtered off, washed with water, and dried to give 5-benzamido-4-carbamoyl-1H-1,2,3-triazole (0.085 g.), m.p. 299° C. (with decomposition).

1. customprepared by the method of J
2. extractionThe reaction mixture was extracted with diethyl ether
3. temperaturethe aqueous layer cooled
4. filtrationthe white precipitate filtered off
5. washwashed well with water
6. stirringThe crude solid was stirred in diethyl ether
7. custompurified
8. dissolutionby dissolving in dilute aqueous sodium hydroxide solution
9. customreprecipitation
10. additionby the addition of concentrated hydrochloric acid
11. filtrationThe solid was filtered off
12. washwashed with water
13. customdried