Abstract
The synthesis, antiviral activity, and stability study of phosphotriester derivatives of 3'-azido-2',3'-dideoxythymidine (AZT) bearing modified l-tyrosinyl residues are reported. These compounds were obtained via phosphoramidite (P(III)) chemistry from the appropriate aryl precursors. All the derivatives were evaluated for their in vitro anti-HIV activity, and they appeared to be potent inhibitors of HIV-1 replication in various cell culture experiments, with EC(50) values between the micro- and nanomolar range, especially in thymidine kinase deficient (TK(-)) cells, showing their ability to act as mononucleotide prodrugs. The proposed decomposition process of these mixed mononucleoside aryl phosphotriesters successively involves an esterase and a phosphodiesterase hydrolysis.
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