Abstract
In an attempt to discover anti-HIV agents with much reduced cytotoxicity from the currently available HIV-reverse transcriptase inhibitors, AZT conjugates of cholanic acids, 2-imidazolidone-4-carboxylic acid and its derivatives, and N,N′-disubstituted 5-hydroxy-tetrahydropyrimidin-2-ones have been synthesized and their anti-HIV profiles determined with CEM-SS cell line. The AZT conjugates with 2-imidazolidone-4-carboxylic acid and 2-pyrrolidone-5-carboxylic acid through an ester linkage, and with N,N′-diphenyl-5-hydroxy-tetrahydropyrimidin-2-one through a succinate tether showed significantly higher therapeutic indexes than AZT while they also retained or enhanced AZT's anti-HIV activity. Thus, structural features that favor the desired therapeutic profile of the conjugates appear to include a five-membered ring cyclic urea or lactam, and six-membered ring cyclic urea with N,N′-diphenyl substitution.
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