反应详情

A mixture of 0.38 g (1.4 mmol) of 2-bromo-1-(4-imidazoyl)ethanone hydrobromide in 10 ml of acetone was warmed until homogeneous, then 0.17 g (1.4 mmol) of amidinothiourea was added and the mixture was heated at reflux for 0.5 hour. The mixture was cooled and the white precipitate was collected, washed with ether, and dried, thereby affording 0.24 g (60%) of 2-guanidino-4-(4-imidazoyl)thiazole hydrobromide, mp 225° (dec). nmr (DMSO-d6) (δ): 8.20 (s, 1H); 8.0 (b, 4H); 7.77 (s, 1H); 7.36 (s, 1H); high resolution mass spectrum: calcd. C7H8N6S: for 208.0531; found: 208.0517; calcd. for C7H8N6S.HBr.H2O: C, 27.37; H, 3.60; N, 27.36; found: C, 27.23; H, 3.57; N, 27.64.

1. additionwas added
2. temperaturethe mixture was heated
3. temperatureat reflux for 0.5 hour
4. temperatureThe mixture was cooled
5. customthe white precipitate was collected
6. washwashed with ether
7. customdried