3-(4-Aroyl-1H-pyrrol-2-yl)-N-hydroxy-2-propenamides, a New Class of Synthetic Histone Deacetylase Inhibitors

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Abstract
Novel 3-(4-aroyl-2-pyrrolyl)-N-hydroxy-2-propenamides are disclosed as a new class of histone deacetylase (HDAC) inhibitors. Three-dimensional structure-based drug design and conformational analyses into the histone deacetylase-like protein (HDLP) catalytic core suggested the synthesis and biological evaluation of compounds 7a−h. Experimental pKi values are in good agreement with VALIDATE predicted pKi values of new derivatives. All compounds 7a−h show HDAC inhibitory activity in the micromolar range, with 7e as the most potent derivative (IC50 = 1.9 μM). The influence of the 4‘-substituent in the aroyl moiety is not significant for the inhibitory activity, as all compounds 7a−g show IC50 values between 1.9 and 3.9 μM. Otherwise, the unsaturated chain linking the pyrrole ring to the hydroxamic acid group is clearly important for the anti-HDAC activity, the saturated analogue 7h being 10-fold less active than the unsaturated counterpart 7a.