New N-substituted 7-aminocephalosporanic acid derivatives as potential agents against Streptococcus pneumoniae. Synthesis and in vitro activity
摘要:
The synthesis and the antimicrobial properties of a new series of cephalosporinic beta-lactam antibiotics is described. The data reported in the present paper show the potential of this type of substituted cephalosporins as new anti Gram-positive antibiotic drugs. In fact, all compounds tested showed a good in vitro antibacterial activity against the most relevant Gram-positive pathogens including resistant species that currently represent unmet medical need. On the contrary, the new synthesized compounds were found to be completely devoid of any activity on Gram-negative bacteria up to a concentration of the single agent of 128 mu g/ml. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis and aldose reductase inhibitory activity of N-(arylsulfonyl)- and N-(aroyl)-N-(arylmethyloxy)glycines
摘要:
Some N-(arylsulfonyl)- C and N-(aroyl)-N-(arylmethyloxy)glycines D were synthesised and tested as aldose reductase inhibitors (ARIs). They are structurally related to the previously described ARIs of type A and B, from which they differ owing to the presence of a spacer, an OCH2 group, between the amino-acid nitrogen and the aromatic ring. The inhibitory activity was evaluated on the bovine lens aldose reductase enzyme. Compounds of types C and D show an inhibitory activity which, in the case of compounds D, is very similar to that reported for the parent compounds B. Kinetic studies carried out on the most active compound (8a), reveal that it produces an inhibition which, depending on its concentration, may be either uncompetitive or noncompetitive with respect to the substrate and the cofactor.