Facile synthesis of bis(4,5-dihydro-1H-pyrazole-1-carboxamides) and their thio-analogues of potential PGE2 inhibitory properties
摘要:
A variety of bis(3-aryl-4,5-dihydro-1H-pyrazole-1-thiocarboxamides) 2a-h were prepared via reaction of bis(2-propen-1-ones) 1a-h with thiosemicarbazide in ethanolic KOH solution. Meanwhile, bis(3-aryl-4,5-dihydro-1H-pyrazole-1-carboxamides) 3a-d were obtained through reaction of 1a-d with semicarbazide hydrochloride in refluxing with acetic acid. Anti-inflammatory activity screening of the synthesized compounds 2a-f,h; 3a-d (at a dose of 50 mg/kg of body weight) utilizing in vivo acute carrageenan-induced paw oedema standard method in rats exhibited that many of the tested compounds reveal considerable anti-inflammatory properties, especially 2e and f which reveal remarkable activities relative to indomethacin (which was used as a reference standard at a dose of 10 mg/kg of body weight). Ulcerogenic liability for the most promising prepared anti-inflammatory active agents (2b,c,e and f) (at a dose of 50 mg/kg of body weight) using indomethacin as a reference standard (at a dose of 10 mg/kg of body weight) indicated that compounds 2b and c exhibit lower ulcer index values than the used reference standard itself PGE(2) inhibitory properties of the highly promising synthesized anti-inflammatory active agents (2b,c,e and f) were determined by PGE2 assay kit technique, which reveal remarkable activities coincide greatly with the observed anti-inflammatory properties. (C) 2008 Elsevier Masson SAS. All rights reserved.
Synthesis of novel chalcone derivatives and their stabilization effect of spiropyran in PMMA films
作者:Zheng Kai Si、Qing Zhang、Min Zhao Xue、Yuan Yuan Zhu、Liang Ming、Qiao Rong Sheng、Yan Gang Liu
DOI:10.1016/j.cclet.2011.04.001
日期:2011.9
Three novel bis-chalcone derivatives with different alkyldioxy spacers were synthesized and dispersed into polymethyl methacrylate (PMMA) chloroform solution with 6-nitro-1'-ethy1-3',3'-dimethylspiro-2H-1-benzopyran-2,2'-indoline (ESP) to prepare photochromic PMMA films in a facile way. After irradiation with 365 nm UV light, the photocrosslinking reaction between chalcone units was proved to retard the decolorization of merocyanine form of the photochromic spiropyran effectively, as results of the steric hindrance produced by photocycloaddition of chalcone groups. It has been found that the bis-chalcone molecule with the shortest spacer has the most effective stabilizing effect on retardation of decoloration of spiropyran. (C) 2011 Yan Gang Liu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.