What are disclosed are compounds, useful as intermediates in the preparation of substituted penem compounds, of the formula ##STR1## methods for making such compounds from intermediates of the formula ##STR2## by reaction of the latter with a nucleophilic compound, methods for making such intermediates from compounds of the formula ##STR3## by reaction of the last-mentioned compounds with a tervalent phosphorus compound, and methods for making said last-mentioned compounds by cyclizing compounds of the formula ##STR4## with a tervalent phosphorus compound.
所披露的是化合物,可用作制备取代的青霉烯化合物的中间体,其
化学式为##STR1##。制备这种化合物的方法是从
化学式为##STR2##的中间体通过与亲核化合物的反应制备,从
化学式为##STR3##的化合物通过与三价
磷化合物的反应制备这种中间体的方法,以及通过将
化学式为##STR4##的化合物与三价
磷化合物环化制备所述的最后提及的化合物的方法。