Synthèse, étude théorique et évaluation biologique de dérivés du 4-amino-4H-1,2,4-triazole analogues des antibiotiques β-lactamiques
摘要:
The synthesis of three classes of potential antibiotic compounds derived from 4-amino-4H- 1,2,4-triazole and related to beta-lactam antibiotics is described. Their originality belongs to the replacement of the beta-lactam carbonyl moiety by another electrophilic centre of the same sp2 geometry. As a result, their interaction with the bacterial target enzyme might lead to the formation of a covalent complex different from the classical acylenzyme. A theoretical study of their structural analogy and their reactivity compared to those of a model beta-lactam justifies their interest in the present context. However, the actual biological results indicate a lack of antibacterial activity.
The synthesis of three classes of potential antibiotic compounds derived from 4-amino-4H- 1,2,4-triazole and related to beta-lactam antibiotics is described. Their originality belongs to the replacement of the beta-lactam carbonyl moiety by another electrophilic centre of the same sp2 geometry. As a result, their interaction with the bacterial target enzyme might lead to the formation of a covalent complex different from the classical acylenzyme. A theoretical study of their structural analogy and their reactivity compared to those of a model beta-lactam justifies their interest in the present context. However, the actual biological results indicate a lack of antibacterial activity.
Evaluation of the Inhibitory Activity on Serine and Aspartic Proteases of 4-Amino-4H-1,2,4-triazole and 5-Aminothiazole Derivatives Structurally Related to β-Lactam Antibiotics
5-aminothiazole have been examined for their inhibitory potential towards serine and aspartic proteases. Upon prolonged incubation with enzyme, the phenylacetylaminothiazolium salts exhibit progressive, time-dependent inhibition of chymotrypsin according to a first-order process. The formation of a tetrahedral transition state-like complex by attack of the active-site serine at the C2-position of the pseudobase