Erythromycin a oxime 11,12-carbonate and its oxime ethers.

Abstract
Erythromycin A oxime 11,12-carbonate (5a)and its oxime ethers 5b .apprx. 5p have been prepared and their antibacterial activities compared with those of erythromycin A (1) and its 11,12-carbonate 2. The oxime 5a and many of its oxime ether derivatives showed good activity in vitro against Gram-positive and the more permeable Gram-negative organisms, in some cases being even more active than the carbonate 2.

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