申请人:YAMANOUCHI PHARMACEUTICAL CO. LTD.
公开号:EP0691343A1
公开(公告)日:1996-01-10
A cephalosporin derivative represented by general formula (I) or a salt thereof, wherein R¹ represents hydrogen, lower alkenyl, lower alkynyl, cycloalkyl, hydroxyl-protecting group, or (un)substituted lower alkyl; R² represents hydrogen, ester residue, or negative charge; R³ represents either (1) a group represented by general formula (a), wherein R⁴ and R⁵ represent each independently lower alkoxy or (un)substituted amino, or R⁴ and R⁵ may be combined together with the neighboring tetrahydropyridazine ring to form an (un)substituted fused 5- or 6-membered ring, or (2) a group represented by general formula (b) or (c), wherein R⁶ and R⁷ represent each independently hydrogen, halogen, amino, azido, carbamoyl, lower alkyl which may be substituted by amino, azido, carbamoyl or halogen, carbamoyl, or (un)substituted 5- or 6-membered heterocyclic group (provided the nitrogen atom of the heterocycle may be substituted to form a quaternary amine); X represents methine (-CH=) or nitrogen; and ring A represents a 4- to 5-membered nitrogenous heterocycle which may contain oxygen.
由一般式(I)表示的头孢菌素衍生物或其盐,其中R¹代表氢、较低的烯基、较低的炔基、环烷基、羟基保护基团,或(未)取代的较低烷基;R²代表氢、酯残基或负电荷;R³表示(1)由一般式(a)表示的基团,其中R⁴和R⁵各自独立地代表较低的烷氧基或(未)取代的氨基,或R⁴和R⁵可以与相邻的四氢吡啶环结合在一起形成(未)取代的融合的5-或6-成员环,或(2)由一般式(b)或(c)表示的基团,其中R⁶和R⁷各自独立地代表氢、卤素、氨基、叠氮基、氨甲酰基、可能被氨基、叠氮基、氨甲酰基或卤素取代的较低烷基,氨甲酰基,或(未)取代的5-或6-成员杂环基团(假设杂环的氮原子可能被取代以形成季铵胺);X代表亚甲基(-CH=)或氮;环A代表可能含氧的4-至5-成员氮杂环。