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Synthesis and evaluation against hepatitis C virus of 7-deaza analogues of 2 '-C-methyl-6-O-methyl guanosine nucleoside and L-Alanine ester phosphoramidates

Bourdin, Claire, McGuigan, Christopher, Brancale, Andrea, Chamberlain, Stanley, Vernachio, John, Hutchins, Jeff, Gorovits, Elena, Kolykhalov, Alexander, Muhammad, Jerry, Patti, Joseph, Henson, Geoffrey, Bleiman, Blair, Bryant, K. Dawn, Ganguly, Babita, Hunley, Damound, Obikhod, Aleksandr, Walters, C. Robin, Wang, Jin, Ramamurty, Changalvala V. S., Battina, Srinivas K. and Rao, C. Srinivas 2013. Synthesis and evaluation against hepatitis C virus of 7-deaza analogues of 2 '-C-methyl-6-O-methyl guanosine nucleoside and L-Alanine ester phosphoramidates. Biorganic and Medicinal Chemistry Letters 23 (7) , pp. 2260-2264.

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7-Deazapurines are known to possess broad antiviral activity, however the 2′-C-methylguanosine analogue displays poor cell permeation and limited phosphorylation, thus is not an efficient inhibitor of hepatitis C virus (HCV) replication. We previously reported the 6-O-methyl entity as a prodrug moiety to increase liphophilicity of guanine nucleosides and the ProTide approach applied to 2′-C-methyl-6-O-methylguanosine has lead to potent HCV inhibitors now in clinical trials. In this Letter, we report the synthesis and biological evaluation of 2′-C-methyl-6-O-methyl-7-deaza guanosine and ProTide derivatives. In contrast to prior studies, removal of the N-7 of the nucleobase entirely negates anti-HCV activity compared to the 2′-C-methyl-6-O-methylguanosine analogues. To understand better this significant loss of activity, enzymatic assays and molecular modeling were carried out and suggested 2′-C-methyl-6-O-methyl-7-deaza guanosine and related ProTides do not act as efficient prodrugs of the free nucleotide, in marked contrast to the case of the parent guanine analogue.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Pharmacy
Systems Immunity Research Institute (SIURI)
Subjects: R Medicine > RM Therapeutics. Pharmacology
Uncontrolled Keywords: HCV; NS5b polymerase; 2′-C-Methyl-6-O-methyl-7-deaza guanosine; ProTide; Phosphoramidate
Publisher: Elsevier
ISSN: 0960-894X
Last Modified: 16 Oct 2017 20:25

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