A new azetidine derivative of the formula: ##EQU1## wherein R.sub.1 represents a penicillin- or cephalosporin-amido group, R.sub.2 represents one of the groups of the following formulae: ##EQU2## wherein R.sub.4, R.sub.5 and R.sub.6 are the same or different and each represents a hydrogen atom or a lower alkyl or alkenyl group, n represents 2 or 3 and - in case formula IIB represents a phenyl group - this group may carry one to four further substituents selected from the group consisting of halogen atoms and lower alkyl, lower alkenyl and phenyl groups, R.sub.3 represents an amino group of the formula ##EQU3## wherein R.sub.7 represents a hydrogen atom or a lower alkyl group and R.sub.8 represents a lower alkyl group, or R.sub.3 represents a N,N'-disubstituted hydrazino group wherein the substituents are lower alkyl groups, e.g. the N,N'-diisopropylhydrazino group, or R.sub.3 represents the group --OR.sub.9, wherein R.sub.9 represents a hydrogen atom, a lower alkyl group, which group may be substituted by 1 to 3 halogen atoms or by 1 or 2 phenyl groups, werein the phenyl groups may be substituted by a methoxy or a nitro group, or R.sub.9 represents a phenacyl group or a salt-forming cation, And corresponding azetidine derivatives of formula I wherein the double bond in the propenyl side chain has been shifted from the 2- to the 1-position, which are versatile intermediates in the process of preparing cephalosporanic and penicillanic derivative.
一种新的azetidine衍
生物,其
化学式为:##EQU1##其中R.sub.1代表
青霉素或
头孢菌素酰胺基团,R.sub.2代表以下式子之一的基团:##EQU2##其中,R.sub.4、R.sub.5和R.sub.6相同或不同,每个代表
氢原子或较低的烷基或
烯基基团,n代表2或3,如果式IIB代表
苯基,则该基团可以携带1到4个进一步的取代基,所选取代基来自于卤素原子和较低的烷基、
烯基和
苯基团的群体,R.sub.3代表以下式子的
氨基基团:##EQU3##其中,R.sub.7代表
氢原子或较低的烷基基团,R.sub.8代表较低的烷基基团,或R.sub.3代表N,N'-二取代的
肼基团,其中取代基是较低的烷基,例如N,N'-
二异丙基肼基团,或R.sub.3代表--OR.sub.9基团,其中R.sub.9代表
氢原子,较低的烷基基团,该基团可以被1到3个卤素原子或1或2个
苯基团取代,其中
苯基团可以被甲
氧基或硝基基团取代,或R.sub.9代表
苯乙酰基团或盐形成阳离子,以及
化学式I中相应的azetidine衍
生物,其中
丙烯基侧链中的双键已从2位移位到1位,这些衍
生物是制备
头孢菌素和
青霉素衍
生物的多用
中间体。