Efficient catalytic hydration of cyanamides in aqueous medium and in the presence of Naringin sulfuric acid or green synthesized silver nanoparticles by using Gongronema latifolium leaf extract

[Display omitted] •Preparation of Naringin sulfuric acid (NSA) as stable heterogeneous and Brønsted acid organocatalyst.•Green synthesis of Ag using Gongronema latifolium leaf extract.•Characterization of NSA by powder XRD, SEM, EDS, TEM, UV–Vis and FT-IR spectroscopy.•One-pot synthesis of N-monosubstituted ureas in good to excellent yields. In this paper, a novel, efficient and green method for the preparation of Naringin sulfuric acid (NSA) as a Brønsted acid organocatalyst and silver nanoparticles (Ag NPs) by using Gongronema latifolium leaf extract as a reducing and stabilizing agent is introduced. The catalysts were characterized using the powder XRD, SEM, EDS, TEM, UV–Vis and FT-IR spectroscopy. Afterward, the catalytic activity of synthesized NSA and Ag NPs were investigated for the synthesis of N-monosubstituted ureas via the hydration of cyanamides in aqueous medium. All products were obtained in good to excellent yields. These methods provided several advantages such as shorter reaction time, simpler work-up and higher yield.