A high hydroarylation activity of K2PtCl4/AgOTf catalyst in the reaction of propiolic acid with unactivated and activated arenes
作者:Juzo Oyamada、Takuya Hashimoto、Tsugio Kitamura
DOI:10.1016/j.jorganchem.2009.07.008
日期:2009.10
hydroarylation with less reactive benzene to give cis-cinnamic acid in good yield. The hydroarylation with toluene gave a higher yield of hydroarylation products than that with benzene and resulted in ortho/para orientation with an almost statistical ratio, suggesting that the result is very close to that of the Friedel-Crafts alkylation with methyl bromide or p-nitrobenzyl chloride. Hydroarylation of propiolic
[EN] COMPOSITIONS COMPRISING AN ARYL PYRAZOLE AND A SUBSTITUTED IMIDAZOLE, METHODS AND USES THEREOF<br/>[FR] COMPOSITIONS COMPRENANT UN ARYL PYRAZOLE ET UN IMIDAZOLE SUBSTITUÉ, PROCÉDÉS ET UTILISATIONS DE CELLES-CI
申请人:MERIAL LTD
公开号:WO2013074892A1
公开(公告)日:2013-05-23
This invention relates to compositions for combating parasites in animals, comprising 1-arylpyrazole compounds in combination with substituted imidazole compounds. This invention also provides for an improved methods for eradicating, controlling, and preventing parasite infestation in an animal comprising administering the compositions of the invention to an animal in need thereof.
1-O-cis-Cinnamoyl-beta-D-glucopyranose is one of the most potent allelochemicals that has been isolated from Spiraea thunbergii Sieb by Hiradate et al. It derives its strong inhibitory activity from cis-cinnamic acid (cis-CA), which is crucial for phytotoxicity. By preparing and assaying a series of cis-CA analogues, it was previously found that the key features of cis-CA for lettuce root growth inhibition are a phenyl ring, cis-configuration of the alkene moiety, and carboxylic acid. On the basis of a structure-activity relationship study, the substituent effects on the aromatic ring of cis-CA were examined by systematic synthesis and the lettuce root growth inhibition assay of a series of cis-CA analogues having substituents on the aromatic ring. While ortho- and para-substituted analogues exhibited low potency in most cases, meta-substitution was not critical for potency, and analogues having a hydrophobic and sterically small substituent were more likely to be potent. Finally, several cis-CA analogues were found to be more potent root growth inhibitors than cis-CA. (C) 2013 Elsevier Ltd. All rights reserved.
GALAMB, V.;ALPER, H., TETRAHEDRON LETT., 1983, 24, N 29, 2965-2968