Synthesis and evaluation of analgesic, antiinflammatory and antiplatelet properties of new 2-pyridylarylhydrazone derivatives
摘要:
This work describes recent results from our research program aiming at the synthesis and pharmacological evaluation of new compounds acting as antiinflammatory, analgesic and platelet antiaggregatory. In this paper the synthesis and the pharmacological profile as analgesic, antiinflammatory and anti-platelet of new functionalized 2-pyridylarylhydrazone derivatives 5a-r are discussed. This class of N-heterocyclic derivatives represents a new series of prototype candidates with analgesic and antiinflammatory properties possessing also an important anti-aggregating activity. The pharmacological results herein disclosed suggest that the antiinflammatory and analgesic activities of these new pyridynehydrazone derivatives observed in the carrageenan pleurisy model and acetic acid writhing test, respectively is probably due to an interference on the arachidonic acid (AA) metabolism. The most important antiinflammatory derivative 2-(2-formylfurane)pyridylhydrazone 5p presented a 79% inhibition of pleurisy at a dose of 80.1 mu mol/kg. We also described the results concerning the mechanism of action of this series of N-heterocyclic derivatives in platelet aggregation which suggest a Ca2+ participation, probably by a complexation scavenger mechanism. Compound 2-(2-formylfurane)pyridylhydrazone 5p was able to complex Ca2+ in in vitro experiments at 100 mu M concentration, indicating that this series of compounds can act as Ca2+ scavenger depending on the nature of the aryl moiety present at the imine subunit. (C) Elsevier, Paris.
inexpensive, nontoxic manganese catalyst enabled unprecedented redox‐neutral carbonylative annulations under ambient pressure. The manganese catalyst outperformed all other typically used base and precious‐metal catalysts. The outstanding versatility of the manganese catalysis manifold was reflected by ample substrate scope, setting the stage for effective late‐stage manipulations under racemization‐free
[Hydroxy(tosyloxy)iodo]benzene mediated the oxidative cleavage of pyridyl hydrazones to regenerate aryl ketones efficiently. Reaction occurred by simply stirring the hydrazone with hypervalent iodinereagent in dichloromethane at room temperature, where aryl ketones are produced up to 90% yield.
作者:Fan-Rui Huang、Qi-Jun Yao、Peng Zhang、Ming-Ya Teng、Jia-Hao Chen、Lu-Chen Jiang、Bing-Feng Shi
DOI:10.1021/jacs.4c04623
日期:2024.6.5
offer straightforward access to a wide range of chiral molecules bearing [2.2.1]-bridged bicyclic cores with four and five consecutive stereocenters in a single step. Two elaborate salicyloxazoline (Salox) ligands were synthesized based on the rational design and mechanistic understanding. The well-defined chiral pockets generated from asymmetric coordination around the trivalent cobalt catalyst direct