Several CD4 mimics have been reported as HIV-1 entry inhibitors which can block the interaction between the viral envelope glycoprotein gp120 and the cell surface protein CD4. We previously found a lead compound 2 (YYA-021) with high anti-HIV activity and low cytotoxicity. Pharmacokinetic analysis however showed compound 2 to have wide tissue distribution and relatively high distribution volumes in rats and rhesus macaques. In the present study we searched for more hydrophilic CD4 mimics with a view to reducing tissue distribution. A new compound (5) with a 1,3-benzodioxolyl moiety was found to have relatively high anti-HIV activity and no significant cytotoxicity. Compound 5 is more hydrophilic than compound 2 and the pharmacokinetics of the intravenous administration of compound 5 in a rhesus macaque showed that compound 5 has lower tissue distribution than compound 2, suggesting that compound 5 possesses a better profile.
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