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F Arena

Publications and source records attributed to F Arena.

At least 73 records · Page 4Linked to original sources
PubMed1983

Research on heterocyclic compounds. XV. Substitution influence on the pharmacological activity in a series of imidazo[1,2-a]pyridines.

We have taken into consideration a group of 28 imidazo [1,2-a]pyridine derivatives, some of which were already known, whereas the others have been synthesized and characterized to complete the series. Antiinflammatory, analgesic, antipyretic and ulcerogenic activities of such compounds were evaluated in comparison with indomethacin. The pharmacological data demonstrated the effects exerted on activity by the presence on the heterocyclic system of methyl substituents and/or an acidic moiety.

Animals↗
PubMed1981

Research on heterocyclic compounds. X.-Imidazo[1,2-a]pyrazine derivatives: synthesis and antiinflammatory activity.

Since we had previously observed the considerable anti-inflammatory activity of imidazo[1,2-a]pyrazine 2-acetic acid, we prepared a series of imidazo[1,2-a]pyrazine derivatives, bearing some substituents on the pyrazine ring and a carboxylic, acetic or alpha-methylacetic moiety on the imidazole ring. These new compounds were tested for antiinflammatory, analgesic, antipyretic and ulcerogenic activities.

Analgesics↗
PubMed1980

[Synthesis of p-aminobenzenesulfonyldiazine].

New sulfones were synthesized; these are analogues of bis-(4-aminophenyl)sulfone (DDS) but contain, instead of one benzene nucleus, a heterocycle that is a pyrimidine, pyrazine or pyridazine nucleus. This was substituted with amine, methoxy, methyl groups or halogens in order to obtain long-acting drugs, similarly to those obtained in the field of sulfonamides. The synthesis was accomplished by reaction of sodium p-amino- or p-acetamidobenzensulfinate with the corresponding halodiazine; only the p-aminophenyl 3-aminopyridazin-6-yl sulfone was obtained by acid hydrolysis. The compounds showed good antitubercular activity in vitro.

Antitubercular Agents↗
PubMed1978

Purification of pseudouridylate synthetase I from Salmonella typhimurium.

Pseudouridylate synthetase from Salmonella typhimurium has been purified 1,000 fold and is about 90% pure. The enzyme has a molecular weight of 50,000 daltons. In the presence of tRNA there is a change in molecular weight from 50.000 to 100.000. This change does not seem to be due to the formation of a tRNA-enzyme complex but rather to a tRNA induced dimerization. Other properties of the enzyme are described.

Amino Acid Sequence↗
PubMed1978

[Structure-activity relationship in reactivators of acetylcholinesterase inhibited by phosphoric esters. XII. Hydroxyiminomethylalkylpyridine iodomethylate].

2-Hydroxyiminomethyl-4-alkylpyridine methiodides were prepared and tested for their in vitro reactivating potency on phosphorylated electric eel cholinesterase. They were also tested as in vivo protecting agents: only one of the compounds, 4-methyl-2-hydroxyiminopyridine, offered a greater protection from DFP than 2-PAM, the others had little to no effect.

Acetylcholinesterase↗
PubMed1977

[Research on heterocyclic compounds. VI. Imidazo(1,2-b)pyridazine derivatives].

The preparation of a group of imidazo[1,2-b]pyridazin-2-carboxylic and -2-acetic acids is reported. The ethyl esters of these acids were prepared by reaction of some 3-aminopyridazines with ethyl bromopyruvate or 4-bromoacetoacetate. The acids were obtained by hydrolysis of the corresponding esters, and their anti-inflammatory activity was tested.

Acetates↗