Name: 3-(Pyridin-4-yl)-1H-pyrazol-5-amine. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 3-(Pyridin-4-yl)-1H-pyrazol-5-amine, is researched, Molecular C8H8N4, CAS is 91912-53-7, about Synthesis and study of the anti-inflammatory properties of some pyrazolo[1,5-a]pyrimidine derivatives. Author is Bruni, Fabrizio; Costanzo, Annarella; Selleri, Silvia; Guerrini, Gabriella; Fantozzi, Roberto; Pirisino, Renato; Brunelleschi, Sandra.
A series of pyrazolo[1,5-a]pyrimidin-7-ones I (R = bromophenyl, methoxyphenyl, thienyl, pyridyl, cyclohexyl, Bu, iso-Pr, nitrophenyl, aminophenyl hydrochloride, and ethylpyridinium iodide) were synthesized to evaluate in vivo and in vitro effects induced by structural modifications at the 2 position of 4,7-dihydro-4-ethyl-2-phenylpyrazolo[1,5-a]pyrimidin-7-one (FPP028). This substance, which has been previously studied, is a weak inhibitor of prostaglandin biosynthesis and a nonacid analgesic and anti-inflammatory agent devoid of ulcerogenic properties. To gain more insight into the mechanism of action of this class of compounds, several in vivo tests were carried out, such as carrageenan-induced rat paw edema and pleurisy. In vitro tests include some studies of leukocyte functions, such as superoxide production and myeloperoxidase release. In vitro effects on arachidonic acid-, ADP, and platelet-activating factor-induced platelet aggregation were also studied. Different anti-inflammatory activities were observed, depending on the nature of substituents at the 2 position; these differences are probably linked to the capacity of these compounds to inhibit leukotrienes and/or prostaglandin biosynthesis with different selectivity. 4,7-Dihydro-4-ethyl-2(2-thienyl)pyrazolo[1,5-a]pyrimidin-7-one proved to be the most interesting compound of the novel synthesized series, showing powerful pharmacol. activity in vivo as well as in vitro, together with very weak acute toxicity.
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