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- W2085698383 abstract "Several 2-substituted oxapenems, la, 1b and 1c, bearing the hydroxyethyl side-chain at 6α were synthesized in a highly stereoselective manner starting from the commercially available 3α-hydroxyethyl-4β-acetoxyazetidinone (5). The stability, in vitro antibacterial activity, and β-lactamase inhibitory properties of these oxapenems were examined. The 2-isopropyl penem 1c had considerable stability as shown by its t1/2 of 200 minutes in pH 7.0 buffer solution and at 37°C, while the other two la and 1b were labile. Interestingly, the antibacterial activity of these compounds paralleled their stability and thus penem 1c showed appreciable MICs, whereas the other two were virtually inactive. All three penems inhibited certain cephalosporinases strongly, but penicillinases only weakly. Thus, the inhibitory spectrum was similar to that for epi-thienamycin B and not the spectrum for clavulanic acid." @default.
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- W2085698383 date "1990-01-01" @default.
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- W2085698383 title "Synthesis and biological properties of 1-oxapenems." @default.
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- W2085698383 doi "https://doi.org/10.7164/antibiotics.43.1441" @default.
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