Process for preparing doubly blocked...

Details Process for preparing doubly blocked... Process for preparing doubly blocked...

C - Chemistry, Metallurgy

07

D

C07D 463/00 (2006.01) C07F 7/10 (2006.01) C07F 9/6561 (2006.01)

Patent

CA 2067708

X-8142 Abstract A process is provided for producing 7-protected- amino-4-protected carboxy-3-halo-1-carbacephalosporins which includes the steps of mixing the hydrochloride salt of the carbacephalosporin with a polar organic aprotic solvent having a dielectric constant of at least about 20 and a base selected from a group consisting of 5- or 6- membered tertiary cyclic amine containing 0-1 oxygen atoms, and dimethylbenzamine to form the free amine of a carbacephalosporin and thereafter without isolating the free amine mixing it with an acylating agent to result in the doubly blocked carbacephalosporin.

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