Water → HCID 53909123, compound

Participants

Reaction Steps

A mixture of 1.60 g of 5-mercapto-7-(trifluoromethyl)-pyrazolo[1,5-a]pyrimidine-3-carboxamide and 1.66 g of (7R)-7-aminocephalosporanic acid in 120 ml of acetonitrile was treated while stirring with 20 ml of a 20 percent solution of boron trifluoride in acetonitrile and stirred at 20° for a further 5 hours. 100 ml of water were added and the mixture was concentrated in a vacuum to a volume of about 80 ml. The pH was adjusted to 2.8 with 25 percent aqueous ammonia. After stirring for 1 hour, the precipitate obtained was filtered, washed in succession with water, acetone and ether and dried. There was obtained (6R,7R)-7-amino-3-[[(3-carbamoyl-7-(trifluoromethyl)pyrazolo[1,5-a]-pyrimidin-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo-[4.2.0]oct-2-ene-2-carboxylic acid.

Provenance & Evidence