反应详情

To a hot (60°) solution of 3-mercapto-s-triazolo[4,3-a]pyridine [D. S. Tarhell et al., J. Am. Chem. Soc. 70, 1381 (1948)] (1.51 g., 10 mmole) and NaHCO3 (1.68 g., 20 mmole) in 0.1 M pH 7.4 phosphate buffer (50 ml.) was added portionwise 7-ACA (2.72 g., 10 mmole) and the mixture was heated at 80°-85° for 30 min. The reaction mixture being treated with carbon, the filtrate was acidified to pH 5 with dil. HCl to give 7-amino-3-(s-triazolo[4,3-a]pyridin-3-ylthiomethyl)-3-cephem-4-carboxylic acid which was collected by filtration, washed with water (10 ml.) and dried in vacuo on P2O5. Yield 1.40 g. (39%). M.p. 215°-220° (dec.).

1. temperaturethe mixture was heated at 80°-85° for 30 min
2. additionThe reaction mixture being treated with carbon