The compounds of the formula (I):
wherein R1 is a hydrogen atom, a trityl group or an acyl group as found in known antibacterially active penicillins or cephalosporins; R2 is a hydrogen atom, a lower alkyl group or an aryl group; R3 is a hydrogen atom, a lower alkyl group, a substituted lower alkyl or a thiosubstituted lower alkyl group; and R4 is a group such that COzR4 is a carboxylic acid group or a salt or readily removable ester thereof; are antibiotics. The compounds may be formulated in pharmaceutical compositions.
Processes for the preparation of the compounds (I) are also described.
式(I)化合物:
其中 R1 是氢原子、三烷基或酰基,如已知的具有抗菌活性的
青霉素或
头孢菌素中的酰基;R2 是氢原子、低级烷基或芳基;R3 是氢原子、低级烷基、取代的低级烷基或
硫代低级烷基;R4 是一个基团,使得 COzR4 是一个
羧酸基团或其盐或易去除的酯;这些化合物是抗生素。这些化合物可配制成药物组合物。
还描述了制备化合物(I)的工艺。