摘要:
7-amino-3-methoxymethyl-3-cephem-4-carboxylic acid of formula (I) can be easily prepared by reacting 7-aminocephalosporanic acid of formula (II) with an azeotropic mixture of trimethyl borate and methanol in the presence of methanesulfonic acid.
摘要:
A process for producing 3-alkenylcephem compounds represented by general formula (3) characterized in that an iodination reagent, an alkali metal hydroxide or carbonate, an arylphosphine, and an aldehyde represented by the general formula (2): R4-CHO are caused to simultaneously act on a 3-chloromethylcephem compound represented by general formula (1) to thereby produce the target compound in one step, wherein R?1, R2, R3 and R4¿ are each as defined in the description.
摘要:
The invention provides an antimicrobial agent capable of producing an excellent effect in the prevention or treatment of bacteria of two or more genera selected from among Streptococcus , Moraxella , Haemophilus , Klebsiella and the like. The agent comprises a penicillin antibiotic, in particular amoxicillin, and a cephem antibiotic, in particular cefixime or cefdinir. The antimicrobial agent of the invention is administered in the form of a mixed preparation containing both or in the form of individual preparations respectively containing them for combined administration.
摘要:
A β-lactam compound and a 2-(substituted methyl)-3-cephem compound, both being useful as an intermediate for the synthesis of cephem antibiotics and so forth. The lactam compound is represented by general formula (I), wherein R1 represents protected amino, etc.; R2 represents hydrogen, etc.; R3 represents hydrogen or a protective group for a carboxyl group; R4 represents optionally substituted aryl; and R5 represents optionally substituted alkenyl, etc. The cephem compound is represented by general formula (II), wherein R?1, R2 and R3¿ are each as defined above; and R6 represents optionally substituted aryl.
摘要:
2-Substituted cephem derivatives represented by the general formula (I), (wherein R1 represents substituted or unsubstituted phenyl, substituted or unsubstituted phenylmethyl, or substituted or unsubstituted phenoxymethyl, R2 represents hydrogen or a carboxylic acid-protecting group, Y represents allyloxy, benzyloxy, alkythio, carboxyalkylthio, or a group represented by the general formula of (II), R4 represents hydrogen or lower alkyl, X represents -O-, -S- or N-CH3, R5 represents hydrogen, lower alkyl or phenyl, and R6 represents hydrogen or lower alkyl), and a process for their preparation.