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cycloSal-Pronucleotides of 2'-fluoro-ara- and 2'-fluoro-ribo-2',3'- dideoxyadenosine as a strategy to bypass a metabolic blockade.

Abstract：

:Novel, lipophilic cycloSal triesters 4a-c and 5a-c were synthesized, respectively, from the ara- and ribo-configurated 2'-fluorinated-2', 3'-dideoxyadenosines 2 and 3. The cycloSal phosphotriesters were used as tools to study the effects of the two different sugar pucker conformations induced by two opposite configurations of the fluorine substituent at C2' of the dideoxyribose moiety. F-ara-ddA (2) is known to be an active anti-HIV agent, whereas the ribo-analogue 3 is inactive. Hydrolysis studies with the triester precursors 4a-c and 5a-c showed selective formation of the monophosphates of 2 and 3. The lipophilicity of the triester prodrugs was considerably increased by the cycloSal mask with respect to ddA (1), F-ara-ddA (2), and F-ribo-ddA (3). Phosphotriesters 4 and 5 proved to be completely resistant to ADA and AMPDA deamination. In parallel experiments, ribo-nucleoside 3 showed a 50-fold faster deamination rate relative to the ara-analogue 2. Against HIV in CEM cells, the phosphotriesters 4 proved to be 10-fold more potent than the parent nucleoside 2. Furthermore, the prodrugs 4 were active against MSV-induced transformation of C3H/3T3 fibroblasts, while 2 was inactive. More interestingly, the ribo-configurated phosphotriesters 5, prepared from the inactive F-ribo-ddA (3), showed a level of anti-HIV activity that was even higher than that of F-ara-ddA (2). Our findings clearly prove that the application of the cycloSal-pronucleotide concept to F-ribo-ddA (3) overcomes a metabolic blockade in the formation of the corresponding monophosphate.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Meier C,Knispel T,Marquez VE,Siddiqui MA,De Clercq E,Balzarini J

doi

10.1021/jm981097r

keywords:

subject

Has Abstract

pub_date

1999-05-06 00:00:00

pages

1615-24

issue

9

eissn

0022-2623

issn

1520-4804

pii

jm981097r

journal_volume

42

pub_type

杂志文章

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