Abstract
A series of quinoxalines variously substituted, namely 3-arylthiomethyl-1,6-dimethylquinoxalin-2-ones (6a-f), 3-arylthiomethyl-1-benzyl-7-trifluoromethylquinoxalin-2-ones (8a-g) and 2-arylthiomethyl-3-benzyloxy-6-trifluoromethylquinoxalines (10a,b,e-h), were synthesized and compared with previous arylphenoxymethylquinoxalines (1a-f, 2af and 3a-b). The purpose was to verify whether the replacement of oxygen with sulphur atom and the insertion of different substituents on the phenyl side chain were able to improve the capability to inhibit the Pgp pump and restore the antiproliferative activity of clinically useful drugs, such as doxorubicin (Doxo), vincristine (VCR) and etoposide (VP16), in drugresistant human nasopharyngeal carcinoma KB cells (KBwt, KBMDR, KB7D and KBV20C). Furthermore, 2,3-bis(aryloxymethyl)- 6-trifluoromethylquinoxalines (13a-c) were designed with the objective to evaluate the capability of the double side chain to potentiate the antiproliferative activity of the drugs tested. Biological assays showed that title compounds were, in general, endowed with good activity as Pgp inhibitors. In particular compound 3a, bearing 2-CONHPh substituent on phenoxymethyl side chain, resulted the most effective, while the double side chain (compound 13c) gives the ability to inhibit a different MRP pump (a membrane glycoprotein named mrp). Furthermore, we can conclude that replacement of oxygen with sulphur atom did not improve the biological activity.
Keywords: 2(3)-aryl-thio(oxy)-methylquinoxalines, antiproliferative activity, multidrug resistance, P-glycoprotein inhibitors, MRP pump, doxorubicin, vincristine, etoposide
Medicinal Chemistry
Title: 2(3)-Aryl-thio(oxy)-methylquinoxaline Derivatives: A New Class of P-Glycoprotein-Mediated Drug Efflux Inhibitors
Volume: 4 Issue: 3
Author(s): Antonio Carta, Sandra Piras, Giuseppe Paglietti, Sabrina Pricl, Paolo La Colla, Bernardetta Busonera and Roberta Loddo
Affiliation:
Keywords: 2(3)-aryl-thio(oxy)-methylquinoxalines, antiproliferative activity, multidrug resistance, P-glycoprotein inhibitors, MRP pump, doxorubicin, vincristine, etoposide
Abstract: A series of quinoxalines variously substituted, namely 3-arylthiomethyl-1,6-dimethylquinoxalin-2-ones (6a-f), 3-arylthiomethyl-1-benzyl-7-trifluoromethylquinoxalin-2-ones (8a-g) and 2-arylthiomethyl-3-benzyloxy-6-trifluoromethylquinoxalines (10a,b,e-h), were synthesized and compared with previous arylphenoxymethylquinoxalines (1a-f, 2af and 3a-b). The purpose was to verify whether the replacement of oxygen with sulphur atom and the insertion of different substituents on the phenyl side chain were able to improve the capability to inhibit the Pgp pump and restore the antiproliferative activity of clinically useful drugs, such as doxorubicin (Doxo), vincristine (VCR) and etoposide (VP16), in drugresistant human nasopharyngeal carcinoma KB cells (KBwt, KBMDR, KB7D and KBV20C). Furthermore, 2,3-bis(aryloxymethyl)- 6-trifluoromethylquinoxalines (13a-c) were designed with the objective to evaluate the capability of the double side chain to potentiate the antiproliferative activity of the drugs tested. Biological assays showed that title compounds were, in general, endowed with good activity as Pgp inhibitors. In particular compound 3a, bearing 2-CONHPh substituent on phenoxymethyl side chain, resulted the most effective, while the double side chain (compound 13c) gives the ability to inhibit a different MRP pump (a membrane glycoprotein named mrp). Furthermore, we can conclude that replacement of oxygen with sulphur atom did not improve the biological activity.
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Carta Antonio, Piras Sandra, Paglietti Giuseppe, Pricl Sabrina, Colla La Paolo, Busonera Bernardetta and Loddo Roberta, 2(3)-Aryl-thio(oxy)-methylquinoxaline Derivatives: A New Class of P-Glycoprotein-Mediated Drug Efflux Inhibitors, Medicinal Chemistry 2008; 4 (3) . https://dx.doi.org/10.2174/157340608784325197
DOI https://dx.doi.org/10.2174/157340608784325197 |
Print ISSN 1573-4064 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6638 |
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