Anthraquinones are of signi cant interest due to their biological activity, coloring properties and synthetic applications. Here, we describe a mild and convenient method for modi cation of 1-ethynyl-4hydroxyanthraquinone that was obtained from the Sonogashira reaction of 1-hydroxy-4iodoanthraquinone with alkynes. The copper(I) catalyzed one-pot three component reaction (A 3 -coupling) of the new 1-ethynyl-4-hydroxyanthraquinone with secondary amines and formaldehyde was the main approach for the synthesis of nitrogen substituted 1-[3-(amino)prop-1-ynyl]-4-hydroxyanthraquinones. The in uence of different substituent in the amine on reaction rate and yield has been evaluated. The cytotoxicity of 1-ethynyl-4-hydroxyanthraquinones was evaluated using the conventional MTT assay. Among all the compounds synthesized, anthraquinone-propargylamine derivatives 28, 29, and possess most promising cytotoxic potential towards glioblastoma cancer cells; compounds 14 and 19 shown selectivity towards the prostate cancer cells DU-145, and 18, and 24 -towards breast cancer cells MCF-7. The grown inhibition on these cancer cells of 18 and 24 was comparable to those of standard drug Doxorubicin. Molecular modeling of new compounds in DNA G-quadruplex binding site was performed to help understand the observed SAR trends.
Anthraquinones are of significant interest due to their biological activity, coloring properties and synthetic applications. Here, we describe a mild and convenient method for modification of 1-ethynyl-4-hydroxyanthraquinone that was obtained from the Sonogashira reaction of 1-hydroxy-4-iodoanthraquinone with alkynes. The copper(I) catalyzed one-pot three component reaction (A3-coupling) of the new 1-ethynyl-4-hydroxyanthraquinone with secondary amines and formaldehyde was the main approach for the synthesis of nitrogen substituted 1-[3-(amino)prop-1-ynyl]-4-hydroxyanthraquinones. The influence of different substituent in the amine on reaction rate and yield has been evaluated. The cytotoxicity of 1-ethynyl-4-hydroxyanthraquinones was evaluated using the conventional MTT assay. Among all the compounds synthesized, anthraquinone-propargylamine derivatives 28, 29, 30 and 34 possess most promising cytotoxic potential towards glioblastoma cancer cells; compounds 14 and 19 shown selectivity towards the prostate cancer cells DU-145, and 18, and 24 – towards breast cancer cells MCF-7. The grown inhibition on these cancer cells of 18 and 24 was comparable to those of standard drug Doxorubicin. Molecular modeling of new compounds in DNA G-quadruplex binding site was performed to help understand the observed SAR trends.
An approach relying on a sequential selective arylation of isopimaric acid/peptide coupling/CuAAC-based macrocyclization procedure of alkynyl peptides to azidoditerpenoid, was developed for the preparation of novel triazole-linked peptide -tricyclic diterpenoid conjugates. The process has comprised the synthesis of azidoditerpenoid bearing the azido group at the side chain by the cross-coupling reaction of isopimaric acid with 1-azido-2-iodobenzene as well as the preparation of a small library of dipeptides featuring varied amino acid sequence (Gly-Gly, Gly-Val, Val-Gly and Val-Val). This approach has shown great chemical efficiency and gave macrocyclic compounds in good yields. It was shown that the yield of macrocyclization products depends on the substituent in the dipeptide fragment. The cytotoxicity of the synthesized compounds was evaluated using the conventional MTT assays. It has been found that the introduction of a dipeptide fragment into the structure of isopimaric acid and macrocyclization have a significant effect on toxicity towards human cancer cells
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