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Abstract
The traceless solid-phase syntheses of 6-oxopurines and pyrazolo[3,4-d]pyrimidines are presented. The effects of these compounds on multidrug resistance protein 4 (MRP4/ABCC4) facilitated efflux was examined. Four of the compounds, 7b, 7c, 15a, and 17e, were active in inhibiting MRP4-mediated efflux of the bimane-glutathione conjugate. In addition, all four compounds were also able to reverse MRP4-mediated resistance to the anticancer drug 6-thioguanine. In the presence of 25 microM 15a or 17e, there was complete reversal. The reversal of resistance was achieved without any effects on the uptake and metabolism of 6-thioguanine.
Published Version
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