Abstract
The synthesis and in vitro antibacterial activity of a series of 6-oxygenated penicillanic acid sulfoxides is described. 6 alpha-Hydroxypenicillanic acid-S(S)-oxide (1a) exhibits weak Gram-negative antibacterial activity and appears to be similar to amdinocillin (5) in its mode of action. 6 alpha-Hydroxypenicillanic acid-S(R)-oxide (4a) has a broader spectrum of activity, but again is rather weak. The corresponding 6 beta-hydroxy series is essentially devoid of activity.
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