| 摘要 |
Compounds of formula (I): <IMAGE> (I) wherein <IMAGE> is a 5-membered heterocyclic group having a 6- pi electron system, the five ring atoms being either (a) one carbon atom and four atoms selected from carbon and nitrogen, (b) two carbon atoms, two nitrogen atoms and one atom selected from oxygen and sulphur, or (c) four carbon atoms and one atom selected from oxygen and sulphur and R1 is a substituent on a carbon or nitrogen of <IMAGE> selected from C1-20 alkyl, C2-8 alkenyl aryl, aralkyl and heterocyclyl, each of which may optionally be substituted; hydrogen and C3-7 cycloalkyl, and, where appropriate, R2 is a substituent on a carbon or nitrogen of <IMAGE> and when present is the same or different to R1 and is selected from C1-20 alkyl, C2-8 alkenyl, aryl, aralkyl and heterocyclyl each of which may optionally be substituted; hydrogen and C3-7 cycloalkyl, have antibacterial and antimycoplasmal activity. |
