NH4Cl Mediated New Protocol for the Synthesis of 5-Arylidene Barbiturates
作者:Khalid Mohammed Khan、Muhammad Ali、Momin Khan、Muhammad Taha、Shahnaz Perveen
DOI:10.2174/157017811794557778
日期:2011.1.1
Eco-benign method for synthesizing arylidene barbiturates has been developed by using ammonium chloride (NH4Cl) in stoichiometric amount, as an enolization activator, in water. Execution of methodology is simple, products obtained in high yields and the reactions are completed within 30 min. The new methodology does not involve any solvent/solvent extraction while solid products were yielded in all cases which were filtered and washed.
2,6-Bis(3,4,5-trihydroxybenzylydene) derivatives of cyclohexanone
作者:Roberta Costi、Roberto Di Santo、Marino Artico、Silvio Massa、Rino Ragno、Roberta Loddo、Massimiliano La Colla、Enzo Tramontano、Paolo La Colla、Alessandra Pani
DOI:10.1016/j.bmc.2003.10.005
日期:2004.1
A number of 2,6-bisbenzylidenecyclohexane-1-one derivatives have been synthesized and tested as HIV-1 integrase (IN) inhibitors with the aim of obtaining compounds capable to elicit antiviral activity at non-cytotoxic concentrations in cell-based assays. 3,5-Bis(3,4,5-trihydroxybenzylidene)-4-oxocyclohexaneacetic acid (20d) resulted one of the most potent and selective derivatives in acutely infected MT-4 cells (EC50 and CC50 values of 2 and 40 muM, respectively). In enzyme assays with recombinant HIV-1 integrase (rIN), this compound proved able to inhibit both 3'-processing and disintegration with IC50 values of 0.2 and 0.5 muM, respectively. In order to develop a model capable to predict the anti HIV-IN activity and useful to design novel derivatives, we performed a comparative molecular field analysis (CoMFA) like 3-D-QSAR. In our model the ligands were described quantitatively in the GRID program, and the model was optimized by selecting only the most informative variables in the GOLPE program. We found the predictive ability of the model to increase significantly when the number of variables was reduced from 20,925 to 1327. A Q(2) of 0.73 was obtained with the final model, confirming the predictive ability of the model. By studying the PLS coefficients in informative 3-D contour plots, ideas for the synthesis of new compounds could be generated. (C) 2003 Elsevier Ltd. All rights reserved.
Khan, Khalid Mohammed; Ali, Muhammad; Ahmad, Aqeel, Journal of the Chemical Society of Pakistan, 2013, vol. 35, # 3, p. 890 - 893
Design, synthesis and biological evaluation of hydroxy- or methoxy-substituted 5-benzylidene(thio) barbiturates as novel tyrosinase inhibitors
作者:Zhiyong Chen、Dachuan Cai、Dehai Mou、Qin Yan、Yifeng Sun、Wenlong Pan、Yiqian Wan、Huacan Song、Wei Yi
DOI:10.1016/j.bmc.2014.04.060
日期:2014.7
Here a new class of hydroxy- or methoxy-substituted 5-benzylidene(thio)barbiturates were designed, synthesized and their inhibitory effects on the diphenolase activity of mushroom tyrosinase were evaluated. The results showed that several compounds had more potent tyrosinase inhibitory activities than the widely used tyrosinase inhibitor kojic acid (IC50 = 18.25 mu M). In particular, 3',4'-dihydroxylated 1e was found to be the most potent inhibitor with IC50 value of 1.52 mu M. The inhibition mechanism analysis revealed that the potential compounds 1e and 2e exhibited such inhibitory effects on tyrosinase by acting as the irreversible inhibitors. Structure-activity relationships' (SARs) analysis also suggested that further development of such compounds might be of interest. (C) 2014 Elsevier Ltd. All rights reserved.