Pyridazines. Part XXIX: synthesis and platelet aggregation inhibition activity of 5-substituted-6-phenyl-3(2H)-pyridazinones. Novel aspects of their biological actions
series of 6-phenyl-3(2H)-pyridazinones with a diverse range of substituents in the 5-position have been prepared and evaluated in the search for new antiplatelet agents. A significant dependence of the substituent on the inhibitory effect has been observed. The pharmacological study of these compounds confirms that modification of the chemical group at position 5 of the 6-phenyl-3(2H)-pyridazinone system
evaluated in vitro for inhibition of plateletaggregation induced by adenosine 5'-diphosphate (ADP), thrombin and collagen. All the tested compounds (except 8 and 9) inhibited plateletaggregation in a dose-dependent manner. The IC50 of the most active substance, compound 2b, was around 60 microM against ADP and collagen as inducers. The inhibition of plateletaggregation caused by test compounds was dependent
Barlocco; Martini; Pinna, Farmaco, Edizione Scientifica, 1987, vol. 42, # 8, p. 585 - 594
作者:Barlocco、Martini、Pinna、Curzu、Sala、Germini
DOI:——
日期:——
Efficient Aromatization of 4,5-Dihydro-3(2<i>H</i>)-Pyridazinones Substituted at 5 Position by Using Anhydrous Copper (II) Chloride
作者:Eddy Sotelo、Enrique Raviña
DOI:10.1080/00397910008087285
日期:2000.1
An efficient conversion of 5-substituted-4,5-dihydro-3(2H)-pyridazinones into their corresponding dehydrogenated derivatives was achieved by treatment with anhydrous copper(II) chloride in acetonitrile.
Pyridazine Derivatives, IX. Synthesis of 2H-Pyridazin-3-ones with Aroylpiperazinyl Groups
-Several 2H-pyridazin-3-ones with phenyl- or 2-furoylpiperazinyl group, have been prepared. 6-Phenyl-5-(N4-aroyl-N1-piperazinyl)-2H-pyridazin-3-ones were obtained by nucleophilic substitution of the chlorine atom of 6-phenyl-5-chloro-2H-pyridazin-3-one or alternatively, by aroylation of N1-piperazinyl-2h-pyridazin-3-one. Also, 6-phenyl-5-(N4-aroyl-N1-piperazinylmethyl)-2H-pyridazin-3-ones were prepared by displacement of the bromine in 6-phenyl-5-bromomethyl-2h-pyridazin-3-one.