Abstract The synthesis of cycloSal-AZTMPs 3a-h as new pro-nucleotides of AZTMP 2 is described. Phosphotriesters 3 selectively release AZTMP 2 by a controlled, chemically induced tandem reaction. CycloSal-AZTMPs 3 exhibited high biological activity in HIV-1/HIV-2 infected CEM/O cells but lost their activity nearly completely in CEM/TK- cells.
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