Pyridine → HCID 131713460, compound

Participants

Reaction Steps

A solution of 0.5 g of dicyclohexyldicarbodiimide in 5 ml of methylene chloride was added to a solution of 1.01 g of the product of Step A, 2 ml of pyridine and 0.656 g of 7-amino-cephalosporanic acid and the mixture was stirred at room temperature to effect precipitation and was vacuum filtered. The product was rinsed with methylene chloride and dried to remove about 0.5 g of dicyclohexylurea. The filtrate was poured into 25 ml of hydrochloric acid and the mixture was stirred for 5 minutes. The decanted organic phase was washed with 25 ml of water and was dried and vacuum filtered. The filtrate was evaporated to dryness and the residue was taken up in isopropyl ether. Efflorescence occured and the mixture was vacuum filtered. The recovered product was rinsed and was dissolved in 4 ml of ethyl acetate 0.18 g of activated carbon were added thereto and the mixture was vacuum filtered. The filter was rinsed with ethyl acetate and the filtrate was stirred while 20 ml of isopropyl ether were added over 5 minutes. The mixture was stirred another 5 minutes and was vacuum filtered. The recovered product was rinsed with isopropyl ether and was dried to obtain the syn isomer of 3-acetoxymethyl-7-[2-(2-tritylamino-4-thiazolyl)-2-(2-amino-2-thioxoethoxyimino)-acetamido]-ceph-3-eme-4-carboxylic acid.

Provenance & Evidence