Convergent synthesis and cruzain inhibitory activity of novel 2-(N′-benzylidenehydrazino)-4-trifluoromethyl-pyrimidines

To search for new cruzain inhibitors, the synthesis of a series of novel 2-(N′-benzylidenehydrazino)-4-trifluoromethyl-pyrimidines in a convergent manner is presented. The cruzain inhibitory activity of some of these compounds was evaluated and a binding model was proposed. All derivatives tested were active and the most significant inhibitory effect (80% at 100 μM) and IC50 value (85 μM) were obtained from the 2-(N′-4-chloro-benzylidenehydrazino)-4-trifluoromethyl-pyrimidine. Although further structural optimization to improve solubility is necessary, the molecular docking studies suggest that these inhibitors occupy the S2 pocket without irreversible enzyme inactivation, through hydrophobic interactions, thus, indicating a desirable mode of interaction for the design of novel inhibitors.

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