Naphthoquinone-dipeptides are synthesized in 76-89% yield from naphthoquinone-amino acid conjugates by N-acylbenzotriazole methodology in aqueous media at 20 ËC.
assay and western blot analysis, compound 3e demonstrated excellent anti-proliferative activity against solid tumor cells and clear accumulation of ubiquitinated cellular proteins. Furthermore, in the microsomal stability assay compound 3e demonstrated much improved metabolic stability compared to bortezomib, emerging as a promising lead compound for further design of non-peptide proteasome inhibitors