Modification of the length and structure of the linker of N(6)-benzyladenosine modulates its selective antiviral activity against enterovirus 71.

Abstract:

:Very recently, we demonstrated that N(6)-isopentenyladenosine, a cytokinin nucleoside, exerts a potent and selective antiviral effect on the replication of human enterovirus 71. The present study is devoted to the structure optimization of another natural compound: N(6)-benzyladenosine. We mainly focused on the exploration of the size and nature of the linker between the adenine and the phenyl ring, as well as on the necessity of the D-ribose residue. More than 30 analogues of N(6)-benzyladenosine were prepared and their antiviral properties were evaluated. Two main methodologies were used for preparation: N(6)-acetyl-2',3',5'-tri-O-acetyladenosine can be regioselectively alkylated either by alkyl halides under base promoted conditions or by alcohols in Mitsunobu reactions. After deacylation with 4 M PrNH2 in MeOH at room temperature for one day, the desired products were obtained in overall high yields. Analysis of the structure-activity relationship clearly shows that the optimal size of the linker is limited to 2 or 3 atoms (compounds 4-7). 2'-Deoxyadenosine derivatives did not elicit any inhibitory or cytotoxic effect, while 5'-deoxynucleosides still induced some cell protective antiviral activity. Based on these observations, it can be hypothesized that there may be another mechanism that is at the base of the antiviral activity of these compounds against enterovirus 71 besides a possible 5'-triphosphorylation followed by a putative inhibitory effect on RNA synthesis.

journal_name

Eur J Med Chem

authors

Drenichev MS,Oslovsky VE,Sun L,Tijsma A,Kurochkin NN,Tararov VI,Chizhov AO,Neyts J,Pannecouque C,Leyssen P,Mikhailov SN

doi

10.1016/j.ejmech.2016.01.036

subject

Has Abstract

pub_date

2016-03-23 00:00:00

pages

84-94

eissn

0223-5234

issn

1768-3254

pii

S0223-5234(16)30036-8

journal_volume

111

pub_type

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