摘要:
A process of preparing a .DELTA..sup.3 -cephalosporanic acid ester derivative which comprises reacting a cephalosporanic acid sulfoxide ester derivative with thionyl halide or a phosphorous halide.The compounds prepared by the process of this invention are useful as intermediate compounds for preparing cephalosporin antibiotics and the compounds themselves are also potential antibacterials.
摘要:
A process of preparing a .DELTA..sup.3 -cephalosporanic acid ester derivative which comrises reacting a cephalosporanic acid sulfoxide ester derivative with thionyl halide or a phosphorous halide.The compounds prepared by the process of this invention are useful as intermediate compounds for preparing cephalosporin antibiotics and the compounds themselves are also potential antibacterials.
摘要:
A process for the preparation of cephalosporanic acid derivatives represented by the formula ##SPC1##Wherein R.sub.1 and R.sub.2, which may be the same or different, each represents a univalent group other than a hydrogen atom, said R.sub.1 and R.sub.2 may be combined to form a divalent group and A represents a divalent group represented by the formulae ##SPC2##Wherein R.sub.3 represents a hydrogen atom or a group which does not contribute to the reaction, which comprises heating a penicillin sulfoxide derivative represented by the formula ##SPC3##Wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above.The cephalosporanic acid derivatives prepared by the process of this invention are useful as a starting material for the preparation of antibacterials.
摘要:
The penicillin derivatives represented by the formula ##SPC1##Wherein ring A represents a 5- or 6-membered single or fused ring which may contain one or more nitrogen atoms, an oxygen atom, or a sulfur atom; R.sup.1, R.sup.2, and R.sup.3, which may be the same or different, each represents a hydrogen atom, a hydroxy group, a lower alkyl group, a nitro group, a halogen atom, or an oxo group; and B represents a p-hydroxyphenyl group or a 1,4-cyclohexadien -1-yl group, and their nontoxic pharmaceutically acceptable salts.The compounds are antibiotics having excellent antibacterial activity in particular with respect to the Pseudomonas genus.
摘要翻译:由式WHEREIN RING A表示的青霉素衍生物代表可含有一个或多个氮原子,氧原子或硫原子的5-或6-元单或稠环; R 1,R 2和R 3可以相同或不同,表示氢原子,羟基,低级烷基,硝基,卤原子或氧代基; B表示对羟基苯基或1,4-环己二烯-1-基及其无毒的药学上可接受的盐。
摘要:
An improved process for the displacement of the acetoxy group of a 7-aminocephalosporanic acid by a heterocyclic thiol in the presence of sulfuric acid.