66511-39-5

Upstream product

• 96855-06-0 (R)-7-Imino-3-(1-methyl-1H-tetrazol-5-ylsulfanylmethyl)-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 

Downstream Products

• 77015-33-9 (6R,7R)-3-(1-Methyl-1H-tetrazol-5-ylsulfanylmethyl)-8-oxo-7-[2,2,2-trichloro-eth-(E)-ylideneamino]-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 
• 66429-65-0 (6R)-7t-amino-3-(1-methyl-1H-tetrazol-5-ylsulfanylmethyl)-8-oxo-(6rH)-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 
• 77015-34-0 (R)-7-[(Z)-2,2-Dichloro-vinylimino]-3-(1-methyl-1H-tetrazol-5-ylsulfanylmethyl)-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 
• 77015-35-1 (6R,7S)-7-(2,2-Dichloro-vinylamino)-3-(1-methyl-1H-tetrazol-5-ylsulfanylmethyl)-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 
• 96855-06-0 (R)-7-Imino-3-(1-methyl-1H-tetrazol-5-ylsulfanylmethyl)-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 

Relevant academic research and scientific papers

PRACTICAL PROCEDURE FOR EPIMERIZATION OF 7α-AMINO-1-OXACEPHEMS TO 7β-AMINO EPIMERS

7α-Amino-1-oxacephems can be epimerized to their 7β-amino epimers by treatment with chloral to give Schiff bases, followed by dehydrochlorination with Huenig base, borohydride reduction, and hydrolysis.