Preparation of Au nanoparticles by Anthemis xylopoda flowers aqueous extract and their application for alkyne/aldehyde/amine A3-type coupling reactions
This paper reports on the green synthesis of gold nanoparticles (Au NPs) by Anthemis xylopoda flowers aqueous extract without the addition of surfactant agents and their application as stable catalysts for propargylamines through one-pot three-component condensation reaction of aldehydes, amines, and alkynes. FT-IR, UV-vis spectroscopy and transmission electron microscopy (TEM) are used for the characterization of Au NPs. Polyphenolics are believed to play an important role in Au NPs biosynthesis through the reduction of gold ions. This method provides high yields and easy work up. In comparison with homogeneous and traditional heterogeneous catalysts, metallic NPs display greater catalytic activity due to the increased metal surface area and require less metal to be used in catalysis. Also, in every case, the Au NPs could be easily recovered and reused several times, and at the end of the process, the product was metal-free.