Journal of Medicinal Chemistry p. 367 - 374 (1989)
Update date:2022-07-29
Topics: Synthesis Nucleosides Structure-Activity Relationship (SAR) Antiviral Activity Title Phosphonoacetic and Phosphonoformic Acid Esters Potential Implications
Lambert, Robert W.
Martin, Joseph A.
Thomas, Gareth J.
Duncan, Ian B.
Hall, Michael J.
Heimer, Edgar P.
Phosphonoacetic acid (PAA, 1) was coupled with various acyclonucleosides, 2'-deoxyuridines, cytidines, and arabinosyluracils, with 2,4,6-triisopropylbenzenesulfonyl chloride (TPS) or dicyclohexylcarbodiimide (DCCI) as condensing agents, to give a range of phosphonate esters.The carboxylic ester linkage of PAA to the 5'-position of 5-bromo-2'-deoxyuridine (BUdR, 3) was achieved via the mixed anhydride formed from (diethylphosphono)acetic acid and trifluoroacetic anhydride.Phosphonoformic acid (PFA, 2) was coupled with BUdR by using the DCCI method to give the phosphonate ester (59).Of these compounds only phosphonate esters in the 2'-deoxyuridine series showed significant activity against herpes simplex virus types 1 and 2.The BUdR-PAA derivative (7) and the BUdR-PFA derivative (59) were highly active, especially the latter, which was more active than the parent nucleoside BUdR (3) against the type 2 virus.The active compounds may exert their effects by extracellular or intracellular hydrolysis to the corresponding antiviral agents, but an intrinsic component of antiviral activity may also be involved.
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