The synthesis and effect of fluorinated chalcone derivatives on nitric oxide production
作者:Javier Rojas、Miguel Payá、José N Dominguez、M Luisa Ferrándiz
DOI:10.1016/s0960-894x(02)00317-7
日期:2002.8
Dimethoxy- and trimethoxychalcone derivatives, with various patterns of fluorination, were synthesized and evaluated for their influence on nitric oxide production. Some of them, chalcones 1, 5, 7, 10, 11 and 17, inhibited NO production with an IC50 in the submicromolar range; 17 is especially noteworthy because of its potency (IC50 30 nM). These effects were not the consequence of a direct inhibitory action on enzyme activity but the inhibition of enzyme expression. (C) 2002 Elsevier Science Ltd. All rights reserved.
SAR and molecular mechanism studies of monoamine oxidase inhibition by selected chalcone analogs
作者:Raed Shalaby、Jacobus P. Petzer、Anél Petzer、Usman M. Ashraf、Ealla Atari、Fawaz Alasmari、Sivarajan Kumarasamy、Youssef Sari、Ashraf Khalil
DOI:10.1080/14756366.2019.1593158
日期:2019.1.1
reversible competitive mode of inhibition. Most of the synthesized chalcone analogs showed a better selectivity toward MAO-B. However, introducing of 2,4,6-trimethoxy substituents on ring B shifted the selectivity toward MAO-A. In addition, we investigated the molecular mechanism of MAO-B inhibition by selected chalcone analogs. Our results revealed that these selected chalcone analogs increased dopamine levels
Ring-chain isomerism in conjugated guanylhydrazones: Experimental and theoretical study
作者:Deepika Kathuria、Sumit S. Chourasiya、Sanjay K. Mandal、Asit K. Chakraborti、Uwe Beifuss、Prasad V. Bharatam
DOI:10.1016/j.tet.2018.04.042
日期:2018.6
first case of ring-chain isomerism in conjugated guanylhydrazones. The acyclic conjugated guanylhydrazone and the corresponding annulated product (4,5-dihydro-1H-pyrazole-1-carboximidamide) could be clearly distinguished by means of UV and NMR spectroscopy. The formation of the ring isomer was further confirmed by single crystal XRD analysis. The time-dependent 1H NMR study indicated the gradual transformation
根据文献报道,在酸性条件下用氨基胍在较短的反应时间(1小时)内处理1,3-二芳基丙烯-2-酮可得到相应的胍。然而,当反应时间增加至12小时时,观察到环环状产物4,5-二氢-1 H-吡唑-1-羧酰亚胺酰胺的形成。这是共轭胍hydr中环链异构的第一种情况。无环共轭和相应的环状产物(4,5-二氢-1 H-吡唑-1-羧酰亚胺)可以通过紫外和核磁共振光谱清楚地区分。通过单晶XRD分析进一步证实了环异构体的形成。时间相关的11 H NMR研究表明开链化合物逐渐转变成环状化合物。使用量子化学方法探索了这两种产物形成的机理见解,结果表明环异构体在热力学上比开链异构体稳定6-11 kcal / mol,发现环化障碍为31.37 kcal /摩尔