摘要:
A compound represented by the formula: ##STR1## wherein R.sub.1 is hydrogen or methoxy; R.sub.2 is hydrogen or hydroxy; R is ##STR2## wherein R.sub.3 and R.sub.4 are hydroxy or acyloxy, Y is oxygen, sulfur or >N-R.sub.5 wherein R.sub.5 is hydrogen or lower alkyl, and Z is sulfur or >N-R.sub.5 wherein R.sub.5 has the same meanings as defined above; and X is ##STR3## wherein R.sub.6 is acyloxy or nitrogen-containing heterocyclicthio which may have substituent(s), a pharmaceutically accpetable salt thereof, and a carboxylic ester thereof.This compound has improved antibacterial activity against Kleb. pneumoniae and Pseud. aeruginosa.
摘要:
Cephem derivatives represented by the formula: ##STR1## wherein R.sub.1 represents a hydrogen atom or a hydroxyl group, R.sub.2 represents a lower alkyl group or a chloro-substituted lower alkyl group, and R.sub.3 represents a lower alkanoyloxy group or a nitrogen-containing heterocyclic thio group,and the pharmaceutically acceptable salts thereof. The cephem derivatives exhibit excellent antibacterial activity and are effective against Gram-positive and Gram-negative bacteria.
摘要:
N-(Substituted chromone-3-carbonyl)phenylglycine derivatives. These derivatives are useful intermediates for cephem compounds which are excellent as antibacterial agents.
摘要:
New chromone derivatives having the formula: ##STR1## wherein A represents a hydrogen atom, a halogen atom or a hydroxyl group, and R.sub.1 represents a lower alkyl or a chloro-substituted lower alkyl group. The derivatives are useful intermediates for synthesis of cephem derivatives as antibacterial drugs.
摘要:
Novel 7.alpha.-methoxycephalosporin derivatives, their pharmaceutically acceptable salts, process for the preparation thereof, and antibacterial drugs involving the derivative or salt. The derivatives or salts are effective against the Gram-positive bacteria and the Gram-negative bacteria.
摘要:
Novel 7.alpha.-methoxycephalosporin derivatives, their pharmaceutically acceptable salts, process for the preparation thereof, and antibacterial drugs involving the derivative or salt. The derivatives or salts are effective against the Gram-positive bacteria and the Gram-negative bacteria.
摘要:
New cephalosporin derivatives having the general formula: ##STR1## wherein R.sub.1 and R.sub.2 each represents hydroxy or acyloxy and their salts, and processes for the production thereof. The cephalosporin derivatives of the present invention are useful as antibacterial drugs.
摘要:
A 3-propenylcephem derivative of the following formula: ##STR1## wherein R.sub.1 represents a fluoro-substituted lower alkyl group or a cyano-substituted lower alkyl group, and A represents a cyclic or an acylic ammonio group, or a pharmaceutically acceptable salt thereof, exhibiting excellent anti-bacterial activities against both Gram-positive bacteria and Gram-negative bacteria; Process for the preparation thereof; Anti-bacterial composition; Intermediate for the 3-propenylcephem derivative; and Process for the preparation of the intermediate.
摘要:
A 3-propenylcephem derivative of the following formula: ##STR1## wherein R.sub.1 represents a fluoro-substituted lower alkyl group or a cyano-substituted lower alkyl group, and A represents a cyclic or an acylic ammonio group, or a pharmaceutically acceptable salt thereof, exhibiting excellent anti-bacterial activities against both Gram-positive bacteria and Gram-negative bacteria; Process for the preparation thereof; Anti-bacterial composition; Intermediate for the 3-propenylcephem derivative; and Process for the preparation of the intermediate.
摘要:
A 3-propenylcephem derivative of the following formula: ##STR1## wherein R.sub.1 represents a fluoro-substituted lower alkyl group or a cyano-substituted lower alkyl group, and A represents a cyclic or an acylic ammonio group, or a pharmaceutically acceptable salt thereof, exhibiting excellent anti-bacterial activities against both Gram-positive bacteria and Gram-negative bacteria; Process for the preparation thereof; Anti-bacterial composition; Intermediate for the 3-propenylcephem derivative; and Process for the preparation of the intermediate.