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At least 649 records · Page 36Linked to original sources

PubMed1988

Synthesis of some derivatives of 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(piperazin-1-yl)-3-quino linecarbo xylic acid (norfloxacin) as potential antibacterial agents.

Twelve new fluoroquinolones, structurally related to norfloxacin, have been synthesized in order to investigate the effect of substituents at the secondary nitrogen of the piperazine ring on antimicrobial activity. The new substances (carbamates, isoureas, guanidines, ureas and cyanamides) tested on a variety of gram-positive and gram-negative organisms showed lower activity than the model compound.

Anti-Bacterial Agents↗

PubMed1979

On the antiarrhythmic activity of one N-substituted piperazine derivative of trans-2-amino-3-hydroxy-1, 2, 3, 4-tetrahydroanaphthalene.

The antiarrhythmic activity of the compound N-(trans-3-hydroxy-1,2,3,4-tetrahydro-2-naphthyl)-N-(3-oxo-3-phenyl-2-methylpropyl)-piperazine hydrochloride, referred to as P11, is studied on anaesthesized cats and Wistar albino rats, as well as on non-anaesthesized rabbits. Four types of experimental arrhythmia are used--with BaCl2, with chloroform-adrenaline, with strophantine G and with aconitine. The compound P11 is introduced in doses of 0.25 and 0.50 mg/kg intravenously and 10 mg/kg orally. The compound manifests antiarrhythmic activity in all models of experimental arrhythmia used, causing greatest inhibition on the arrhythmia induced by chloroform-adrenaline (in 90 per cent) and with BaCl2 (in 84 per cent). The results obtained are associated with the beta-adrenoblocking and with the membrane-stabilizing action of the compound.

2-Naphthylamine↗

PubMedDate not supplied

Synthesis and preliminary pharmacological evaluation of 3-[2-(1-aryl-piperazin-4-yl)ethyl]-3,4-dihydro-3-methyl-6-R-1,2, 4-benzotriazines.

A set of 3-[2-(1-aryl-piperazin-4-yl)ethyl]-3,4-dihydro-3-methyl-1,2, 4-benzotriazines, bearing different substituents on the aromatic nuclei, was prepared and found to be endowed with good antihypertensive activity. The simplest compound 1, subjected to a broad pharmacological screening, exhibited also analgesic and antiallergic activities and hints of hypocholesterolemic action. Moreover this compound inhibited (in vitro tests) the guinea pig ileum contractions induced by several agents, the rat vas deferens contractions induced by phenylphrine (alpha 1 antagonism), the platelet aggregation induced by arachidonate and the tracheal tone.

Animals↗

PubMed1950