The design, synthesis, and anti-inflammatory evaluation of a drug-like library based on the natural product valerenic acid

The plant natural product, valerenic acid ( 1 ) was chosen as a desirable scaffold for the generation of a novel screening library due to its drug-like physicochemical parameters (such as Log P, hydrogen bond donor/acceptor counts, and molecular weight). An 11-membered amide library ( 2 – 12 ) was subsequently generated using parallel solution-phase synthesis and Ghosez’s reagent. The chemical structures of all semi-synthetic analogues ( 2 – 12 ) were elucidated following analysis of the NMR, MS, UV and IR data. The structures of compounds 8 and 11 were also confirmed by X-ray crystallographic analysis. All library members were evaluated for their ability to inhibit the release of IL-8 and TNF-α. Six analogues showed moderate activity in the IL-8 assay with IC 50 values of 2.8–8.3 μM, while none of the tested compounds showed any significant effect on inhibiting TNF-α release.