Compounds of the general formula (I) ##STR1## wherein R.sup.1 and R.sup.2 are selected from a lower alkyl group, a phenyl group (optionally substituted by one or more hydroxy or lower alkoxy groups), a pyridyl group or a group --CO.sub.2 R where R is a lower alkyl group, (provided that when R.sup.1 is a group --CO.sub.2 R, R.sup.2 is a lower alkyl group) are disclosed. The compounds of formula (I) are useful as intermediates to compounds of other ring systems which are of pharmacological interest. Certain of the compounds of formula (I) are also useful as antimicrobial agents.
通式(I)的化合物如下:##STR1##其中R.sup.1和R.sup.2选自较低的烷基,苯基(可选地被一个或多个羟基或较低的烷氧基取代),
吡啶基或一个羧基 --CO.sub.2 R,其中R是一个较低的烷基(但当R.sup.1是羧基 --CO.sub.2 R时,R.sup.2必须是较低的烷基)。该通式(I)的化合物可用作其他药理学感兴趣的环系统的中间体。其中某些通式(I)的化合物也可用作抗微
生物剂。