Cheil Foods & Chemicals, Inc.

Rok L Yun

Choong S Kim

Yeo H Yoon

Yang S Ahn

Chun S Lyu

Sung Yong Park

Kwang Hee Lee

Sung Kwang Cho

Je Hak Kim

Seung Ho An

Seong Yeon Park

Nam Hee Lee

Kyoung E Choi

Koun H Lee

Kang Y Jung

Keon H Lee

The present invention relates to novel cephem compounds having the formula: ##STR1## wherein, Q is a carbon or nitrogen atom; X is an oxygen atom, or a nitroalkyl or cyanoimine group, with the proviso that X cannot be an oxygen atom when Q is a carbon atom; R.sub.1 is a hydrogen atom, or a lower alkyl group, or a lower alkyl group which may be substituted by fluoro, or by a carboxylic group or an inorganic cation salt thereof; and R.sub.2 and R.sub.3 independently are a hydrogen atom or a lower alkyl group; or pharmaceutically acceptable salts thereof. The compounds of the present invention have potent antibacterial activities against gram-negative bacteria, especially Pseudomonas, and a longer half-life than conventional cephem compounds.

Cephem compounds

Novel semi-synthetic cephalosporin derivatives having a fused pyridiniummethyl at 3-position of the cephem nucleus, pharmaceutically acceptable salts, physiologically hydrolizable esters or solvates thereof are disclosed. Also disclosed is a process for preparing the cephalosporin derivatives which comprises introducing a fused pyridiniummethyl substituent at 3-position of 7-.beta.-[(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-cephem-ca rboxylic acid derivatives. The compounds of the present invention show potent antibacterial activities and a broad spectrum against both gram-positive and gram-negative bacteria.

3-fused pyridiniummethyl cephalosporins

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Kyonggi-do, South Korea

Rok L Yun