Aryl nucleoside H-phosphonates. Part 15: Synthesis, properties and, anti-HIV activity of aryl nucleoside 5′-α-hydroxyphosphonates

Aryl nucleoside 5'-H-phosphonates 4 bearing AZT or 2',3'-dideoxyuridine moieties were subjected to reaction with various aromatic aldehydes to produce nucleoside 5'-alpha-hydroxyphosphonate derivatives 2 as potential anti-HIV agents. Stability of the title compounds in cell culture media was investigated and three distinct decomposition pathways were identified. The anti-HIV activity of hydroxyphosphonates 2 correlates well with the type and extent of their chemical or enzymatic degradation in culture medium (RPMI 1640 containing 10% FBS), suggesting that aryl nucleoside 5'-hydroxyphosphonates 2 act as depot forms of the parent antiviral nucleosides.

Synthesis and anti-retroviral activity of O,O'-bis(3'-azido-2',3'-dideoxythymidin-5'-yl) phosphoramidate derivatives

A simple and efficient protocol for the preparation of various symmetrical dinucleoside phosphoramidates derived from AZT, is presented. It consists of the phosphonylation of AZT with phosphonic acid in the presence of DCC to produce the symmetrical H-phosphonate diester, followed by its oxidative conversion to various phosphoramidate analogues. The synthesized compounds were evaluated for their anti-HIV activity in different cell cultures.