Ultrasound-assisted synthesis of novel chalcone, heterochalcone and bis-chalcone derivatives and the evaluation of their antioxidant properties and as acetylcholinesterase inhibitors
The chalcone and bis-chalcone derivatives have been synthesized under sonication conditions via Claisen-Schmidt condensation with KOH in ethanol at room temperature (20-89%). The structures were established on the basis of NMR, IR, Single-crystal XRD, and MS. The best compound 3u had inhibitory activity (IC50 = 7.50 µM). The synthesis, the antioxidative properties, chemical reactivity descriptors supported
5-dimethoxyterephthaldehyde with the respective R-acetophenone [where R = H (1a and 2a) and ortho-hydroxy (1b and 2b)] in 1 : 2 mole ratio. The presence of a methoxy (OMe) substituent on the central phenyl ring of bis-chalcone has weakened the C=C bond at the α,β-unsaturated ketone moiety of 2a and 2b. Interestingly, the OMe group has improved the emission efficiency of the bis-chalcone; that is, the quantum
Facile epoxidation of α, β-unsaturated ketones with urea-2,2-dihydroperoxypropane as a new oxidant
作者:Kaveh Khosravi、Shirin Naserifar
DOI:10.1007/s13738-016-0980-1
日期:2017.2
AbstractVarious aromatic α, β-unsaturatedketones were successfully transformed into their corresponding epoxides using urea-2,2-dihydroperoxypropane as the oxygen source for the first time. The reactions were carried out under mild alkaline conditions at room temperature in high yields and short reaction times. Graphical Abstract
Synergistic antifungal effect of cyclized chalcone derivatives and fluconazole against <i>Candida albicans</i>
作者:Aijaz Ahmad、Mohmmad Younus Wani、Mrudula Patel、Abilio J. F. N. Sobral、Adriano G. Duse、Faisal Mohammed Aqlan、Abdullah Saad Al-Bogami
DOI:10.1039/c7md00440k
日期:——
Cyclized bis-chalcone derivatives show synergistic antifungal interactions with fluconazole by ergosterol biosynthesis inhibition evidenced by down regulation of ERG11 gene expression.
New Bis(chalcones) and Their Transformation into Bis(pyrazoline) and Bis(pyrazole) Derivatives
作者:Diana C. G. A. Pinto、Artur M. S. Silva、José A. S. Cavaleiro、José Elguero
DOI:10.1002/ejoc.200390117
日期:2003.2
The reaction of bis(chalcones) 1a−d and bis(chalcone) tetrabromo derivatives 3a−d with hydrazine hydrate gave bis(pyrazolines) 4a−d and bis(pyrazoles) 5a−d, respectively. Bis(pyrazoles) 5e,f bearing hydroxyphenyl substituents have been prepared from the reaction of bis(chromones) 6c,d with hydrazine hydrate, because their synthesis from the corresponding benzyloxy-substituted 5c,d gave very poor yields