申请人:Hoechst Aktiengesellschaft
公开号:US04510086A1
公开(公告)日:1985-04-09
What are disclosed are compounds, useful as intermediates in the preparation of substituted penem compounds, of the formula ##STR1## wherein R is a removable esterifying group, R.sup.2 is hydrogen, lower alkyl, lower alkoxyalkyl, lower alkanoyloxyalkyl, or tri-lower alkylsilyloxyalkyl, and R.sub.a, R.sub.b, R.sub.c, R.sub.d, and R.sub.e are hydrogen, aliphatic cycloaliphatic hydrocarbon, free or esterified carboxyl, halo, or cyano, and any two of R.sub.a -R.sub.e, taken together, may form a cycloaliphatic ring.
所披露的化合物可用作取代的penem化合物制备中间体,其化学式为##STR1##其中R是可拆卸的酯基化基团,R.sup.2是氢、较低的烷基、较低的烷氧基烷基、较低的烷酰氧基烷基或三较低烷基基硅氧烷基,而R.sub.a、R.sub.b、R.sub.c、R.sub.d和R.sub.e分别是氢、脂肪环烷烃、自由或酯化羧基、卤素或氰基,其中任意两个R.sub.a-R.sub.e在一起可以形成环状脂环烷基。