Synthesis of isothiazol-3-one derivatives as inhibitors of histone acetyltransferases (HATs)
作者:Stephen Gorsuch、Vassilios Bavetsias、Martin G. Rowlands、G. Wynne Aherne、Paul Workman、Michael Jarman、Edward McDonald
DOI:10.1016/j.bmc.2008.11.079
日期:2009.1
High-throughput screening led to the identification of isothiazolones 1 and 2 as inhibitors of histone acetyltransferase (HAT) with IC50s of 3 mu M and 5 mu M, respectively. Analogues of these hit compounds with variations of the N-phenyl group, and with variety of substituents at C-4, C-5 of the thiazolone ring, were prepared and assayed for inhibition of the HAT enzyme PCAF. Potency is modestly favoured when the N-aryl group is electron deficient (4-pyridyl derivative 10 has IC50 = 1.5 mu M); alkyl substitution at C-4 has little effect, whilst similar substitution at C-5 causes a significant drop in potency. The ring-fused compound 38 has activity (IC50 = 6.1 mu M) to encourage further exploration of this bicyclic structure. The foregoing SAR is consistent with an inhibitory mechanism involving cleavage of the S-N bond of the isothiazolone ring by a catalytically important thiol residue. (C) 2008 Elsevier Ltd. All rights reserved.