There are disclosed a .beta.-lactam compound represented by the formula (I): ##STR1## wherein R.sub.1 represents an acyl group; M represents a hydrogen atom, a protective group of an eliminatable group which is easily hydrolyzable in a human body; B represents a group represented by the formula (b): ##STR2## where at least one of R.sub.2, R.sub.3 and R.sub.9 represent a group represented by the formula: -A-OR.sub.4 where R.sub.4 represents a hydrogen or a lower alkyl group; and A represents a straight or branched alkylene group having 1 to 6 carbon atoms; and a remaining group or groups are each independently a hydrogen atom; a cyano group; a lower alkyl group which may be substituted by a halogen atom; a carbamoyl group which may be substituted by a lower alkyl group; a cycloalkyl group; or a carboxyl group which may be substituted by a protective group of an eliminatable group which is easily hydrolyzable in a human body, and also when R.sub.9 is -A-OR.sub.4, R.sub.2 and R.sub.3 may be combined with each other to form an alkylene group having 3 to 4 carbon atoms; and Z represents a nitrogen atom or a group represented by the formula: C-R.sub.10 where R.sub.10 represents a hydrogen atom, a carboxyl group or a lower alkyl group which may be substituted by a hydroxy group or a lower alkoxy group, or its pharmaceutically acceptable salt, and a process for preparing the same, an intermediate for synthesis of the same and a medicinal composition for bacterially infectious disease therapy containing the same.
                            公开了一种β-内酰胺化合物,其表示为公式(I):##STR1## 其中R.sub.1表示酰基;M表示氢原子,易于
水解的可消除基的保护基;B表示由公式(b)表示的基团:##STR2## 其中R.sub.2,R.sub.3和R.sub.9中的至少一个表示由公式-A-OR.sub.4表示的基团,其中R.sub.4表示氢或较低的烷基基团;A表示具有1至6个碳原子的直链或支链烷基基团;其余的基团各自独立地表示氢原子;
氰基;可以被卤素原子取代的较低烷基基团;可以被较低烷基基团取代的
氨基甲酰基团;环烷基团;或者可以被易于
水解的可消除基的保护基取代的羧基团;当R.sub.9为-A-OR.sub.4时,R.sub.2和R.sub.3可以结合形成具有3至4个碳原子的烷基基团;Z表示氮原子或由公式C-R.sub.10表示的基团,其中R.sub.10表示氢原子,羧基或可以被羟基或较低的烷氧基取代的较低烷基基团,或其药学上可接受的盐,以及制备其的方法,用于治疗细菌感染疾病的药用组合物。