Palladium-Catalysed Arylation of Poly(Ethylene Glycol) Bound Acrylate with Aryl Iodides in Water: A Liquid-Phase Synthesis of Trans-Cinnamic Acids

Novel Piperazine Amides of Cinnamic Acid Derivatives as Tyrosinase Inhibitors

Background:

A series of novel cinnamic acid piperazine amide derivatives has been designed and synthesized, and their biological activities were also evaluated as potential tyrosinase inhibitors.

Methods:

Compounds 9, 11 and 17 showed the most potent biological activity (IC50 = 66.5, 61.1 and 66 µM, respectively). In silico docking simulation was performed to position compound 11 into the Agaricus bisporus mushroom tyrosinase’s active site to determine the putative binding interactions.

Results and Conclusion:

The results indicated that compound 11 could serve as a promising lead compound for further development of potent tyrosinase inhibitors.

Reactions of nitroxides 15. Cinnamates bearing a nitroxyl moiety synthesized using a Mizoroki-Heck cross-coupling reaction

Cinnamic acid derivatives bearing a nitroxyl moiety (2,2,6,6-tetramethyl-1-oxyl-4-piperidyl 3-E-aryl acrylates) were synthesized in 30–100% yield using a Mizoroki–Heck cross-coupling reaction between 4-acryloyloxy-2,2,6,6-tetramethylpiperidine-1-oxyl and iodobenzene derivatives in the presence of palladium(II) acetate coordinated with a tri(o-tolyl)phosphine ligand immobilized in a polyurea matrix.