申请人:Gist-Brocades N.V.
公开号:US04007202A1
公开(公告)日:1977-02-08
Novel azetidine derivatives of the formula ##STR1## wherein R.sub.1 is an acylamido group, R.sub.2 is selected from the group consisting of ##STR2## wherein R.sub.4, R.sub.5 and R.sub.6 are individually selected from the group consisting of hydrogen, lower alkyl and lower alkenyl, n is 2 or 3 and -- in the case when formula IIB is a phenyl - this group may carry one to four substituents selected from the group consisting of halogen, lower alkyl, lower alkenyl and phenyl, and R.sub.3 is lower alkyl optionally substituted with 1 or 2 phenyls which phenyl groups may be substituted with nitro and the dotted lines of formula IIB indicate the optional presence of double bonds and a process for their preparation and process for the preparation of cephalosporanic acid derivatives using the azetidines of formula I as intermediates.
新型环丙胺衍生物的化学式如下:其中R.sub.1是酰胺基团,R.sub.2从以下组中选择:其中R.sub.4、R.sub.5和R.sub.6分别从氢、低烷基和低烯基组中选择,n为2或3;当化合物IIB为苯基时,该基团可携带一个到四个卤素、低烷基、低烯基和苯基中选择的取代基,R.sub.3是低烷基,可选择性地取代1或2个苯基,这些苯基可能被硝基取代,化合物IIB的虚线表示双键的可选存在;提供了它们的制备方法以及使用化合物I作为中间体制备头孢菌素酸衍生物的方法。