Hydrochloric Acid → 7-Amino-3-(pyrido[2,1-c]-s-triazol-3-ylthiomethyl)-3-cephem-4-carboxylic Acid

Participants

Reaction Conditions

Reaction Steps

2.72 g (0.01 mol) of 7-aminocephalosporanic acid was suspended in 18 ml of water, and a suspension of 2.1 g (0.025 mol) of sodium bicarbonate in 20 ml of water was added dropwise thereto over a period of time of 10 minutes. The inside temperature of the reactor was then increased to 50° C., and a suspension of 1.81 g (0.0125 mol) of 3-mercaptopyrido[2,1-c]-s-triazole in 35 ml of acetone was added dropwise thereto over a period of time of 10 minutes. The resulting mixture was refluxed for 4 hours at a stable inside temperature of the reactor of 63° C. followed by ice cooling the mixture. After the inside temperature of the reactor reached 4° C., the mixture was adjusted to a pH of 3.6 with 6 N hydrochloric acid. One hour after the stirring, the precipitated crystals were filtered and dried over phosphorus pentoxide under reduced pressure to obtain 2.31 g (yield: 61%) of the tilted compound having a melting point (decomposition) of 173° to 175° C.

Provenance & Evidence