There is disclosed a novel β-lactam antibiotics represented by the formula:
wherein A is a group represented by the formulae
where R6 is a hydrogen atom or a lower alkyl group; R, and R2 are independently a hydrogen atom or a protective group; R3 is a hydrogen atom or a methoxy group; X is a hydrogen atom, a hydroxyl group, a protected hydroxyl group, a halogen atom, a lower alkoxy group or a nitro group; n is an integer of 1 or 2; Y is a group represented by the formulae:
provided that a carbon atom which is bonded by a carboxyl group being bonded to nitrogen atom; M is a hydrogen atom, a protective group or an easily hydrolyzable group in a human body;
R7 is a hydrogen atom, a methyl group a lower alkoxymethyl group or a group represented by the formula: -CH2-T where T is an acyloxy group, a carbamoyloxy group, a quaternary ammonium, a substituted or unsubstituted heterocyclic ring or a formula: -S-R8 where R8 is an acyl group or a substituted or unsubstituted heterocyclic ring,
R4 and R5 are each hydrogen atoms or combined with each other to form additional direct bond; Z is a direct bond or a carbonyl group when R4 and R5 are hydrogen atoms, or a formula: -O-B- where the oxygen atom is bonded to nitrogen atom and B is a straight, branched or cyclic alkylene group when R4 and R5 are combined with each other to form additional direct bond,
or its pharmaceutically acceptable salt.
本发明公开了一种新型β-内酰胺类抗生素,由式:
其中 A 是由式表示的基团
其中 R6 是氢原子或低级烷基;R 和 R2 独立地是氢原子或保护基;R3 是氢原子或甲氧基;X 是氢原子、羟基、保护羟基、卤素原子、低级烷氧基或硝基;n 是 1 或 2 的整数;Y 是由式表示的基团:
M是氢原子、保护基团或人体中易
水解的基团;
R7 是氢原子、甲基、低级烷氧基甲基或由式表示的基团:-
CH2-T,其中 T 是酰氧基、
氨基甲酰氧基、季
铵、取代或未取代的杂环或式: -S-R8 其中 R8 是酰氧基、
氨基甲酰氧基、季
铵、取代或未取代的杂环:-S-R8,其中 R8 是酰基或取代或未取代的杂环、
当 R4 和 R5 为氢原子时,Z 为直接键或羰基,或式: -S-R8 其中 R8 为酰基或取代或未取代的杂环:当 R4 和 R5 彼此结合形成额外的直接键时,Z 是直接键或羰基;或式:-O-B- 其中氧原子与氮原子结合,B 是直链、支链或环状亚烷基、
或其药学上可接受的盐。