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The indole ring systems of the cytosolic phospholipase A(2)alpha (cPLA(2)alpha) inhibitor 1-[3-(4-octylphenoxy)-2-oxopropyl]indole-5-carboxylic acid (2) and the isomeric 6-carboxylic acid (3) were replaced by benzimidazole, benzotriazole and indazole scaffolds, respectively. The effect of the structural variations on cPLA(2)alpha inhibitory potency, metabolic stability and solubility was studied. The lead 2 and the indazole-5-carboxylic acid 28 were the metabolically most stable compounds in an assay with rat liver microsomes, while the benzimidazole-5-carboxylic acid derivative 13 possessed the best water solubility (22 microg/mL at pH 7.4). The indazole-5-carboxylic acid 28 revealed the highest cPLA(2)alpha inhibitory potency of the compounds in this series. With an IC(50)-value of 0.005 microM it was about sevenfold more active than the lead 2.


Stefanie Bovens, Martina Kaptur, Alwine Schulze Elfringhoff, Matthias Lehr. 1-(5-Carboxyindol-1-yl)propan-2-ones as inhibitors of human cytosolic phospholipase A2alpha: synthesis and properties of bioisosteric benzimidazole, benzotriazole and indazole analogues. Bioorganic & medicinal chemistry letters. 2009 Apr 15;19(8):2107-11

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PMID: 19327988

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