Novel bicyclic .beta.-lactams and intermediates useful in their preparation are disclosed. In particular, 7.beta.-acyl-amino- and 7.beta.-amino-8-oxo-4-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acids are prepared. The acylated compounds are antibacterial agents.
披露了新型的双环β-内酰胺和其在制备中有用的中间体。特别是,制备了7β-酰
氨基-和7β-
氨基-8-氧代-4-噻-1-
氮杂双环[4.2.0]辛-2-烯-2-
羧酸。这些酰化化合物是抗菌剂。