Nonnucleoside HIV-1 reverse transcriptase inhibitors: Part I. Synthesis and structure-activity relationship of 1-alkoxymethyl-5-alkyl-6-naphthylmethyl uracils as HEPT analogues.

Abstract:

1-alkoxymethyl-5-alkyl-6-naphthylmethyl uracils, which are novel 1-[(2-hydroxyethoxy)methyl]-6-(phenylthio)thymine (HEPT) analogues, were synthesized for evaluation as selective and potent nonnucleoside human immunodeficiency virus (HIV)-1 reverse transcriptase inhibitors. The anti-HIV-1 activity of these compounds was assayed in vitro using HIV-1 infected MT-4 and CEM bioassays. The EC50, CC50 and SI were recorded and calculated. The appropriate position, especially in the 1-position of the naphthyl ring, led to dramatic increases in potency, in both MT-4 and CEM cellular assays. The most important compounds in this series, 1-ethoxymethyl-5-isopropyl-6-(1-naphthylmethyl)thymine 8l (IC50=17 nM, CC50=38332 nM, SI=2229) and 1-benzyloxymethyl-5-ethyl-6-(1-naphthylmethyl)thymine 8n (IC50=17 nM, CC50=32560 nM, SI=1889) were significantly more potent than HEPT (EC50=7.0 microM, CD50=740 microM) in the anti-HIV-1 in vitro cellular assay.

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