| 摘要 |
A 6 beta -substituted penicillanic acid of the formula XII: <IMAGE> or a pharmaceutically acceptable salt or ester thereof, wherein A and B are each hydrogen wherein the carbon atoms to which A and B are attached are linked by a single bond, or A and B together form a bond, wherein the carbon atoms to which A and B are attached are linked by a double bond, R1 is selected from the group consisting of a) hydrogen, b) a pharmaceutically acceptable salt and c) a pharmaceutically acceptable group selected from the group consisting of C1-10 alkyl, C2-10 alkenyl, C2-10 alkynyl, C3-10 cycloalkyl, C3-10 cycloalkenyl, allyl, aryl, aralkyl, aralkenyl, aralkynyl, heterocyclyl, heterocyclylalkyl, heterocyclylalkenyl, heterocyclylalkynyl and alkylheterocyclyl; wherein said group c) is unsubstituted or substituted with a substituent selected from the group consisting of floro, chloro, bromo, iodo, azido, nitro, monoalkyl substituted amino, dialkyl substituted amino, aryl substituted amino, alkanoylamino, arylcarbonylamino, cyano, hydroxy, alkoxy, aryloxy, alkanoyloxy, arylcarbonyloxy, mercapto, alkylthio, arylthio, alkanoylthio, arylcarbonylthio, oxyimino, alkoxyimino and carboxy, and n is an integer between 0 and 2.
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