Activated Carbon/MoO3: Efficient Catalyst for Green Synthesis of Chromeno[d]pyrimidinediones and Xanthenones

An innovative magnetic l-lysine-dialdehyde nanocellulose for sonochemical heterogeneous catalysis in the green synthesis of ultrapure tri-substituted imidazoles

In this contribution, we report the first ultrasound-assisted synthesis of magnetically modified l-lysine dialdehyde nanocellulose and its use in an efficient ecological catalytic application. The structure of designed nanomaterial [Lys-g-DANC)@Fe3O4] was successfully elucidated using various structural, morphological, thermal, optical and magnetic techniques. Next, it was utilized as a heterogeneous nano-catalyst in an ecofriendly and effective process following one-pot multicomponent synthesis of tri-substituted imidazoles. The catalytic procedure afforded seven imidazole byproducts in outstanding yields (83.45-97.13 %) using ultrasound irradiation, 0.03 g of [Lys-g-DANC)@Fe3O4], 10 mL of ethanol at 45 °C and in limited time ranges (1.5-3 h). The structures of obtained imidazole derivatives were elucidated using FTIR and NMR spectroscopic techniques. This work proves the efficiency of magnetically l-lysine nanocellulose in catalytic procedures compared to classical heating protocols including increased yields, limited reaction time ranges, simple catalyst separation and its effective recyclability.

Employing of Fe3O4/CuO/ZnO@MWCNT MNCs in the solvent-free synthesis of new cyanopyrroloazepine derivatives and investigation of biological activity

In this research, we synthesized the Fe₃O₄/CuO/ZnO@MWCNT magnetic nanocomposites using water extract of Petasites hybridus rhizome, and the high performance of synthesized catalyst was confirmed by using in the solvent-free multicomponent reactions of isatoic anhydride, N-methylimidazole, alkyl bromides, activated acetylenic compounds and 2-aminoacetonitrile at ambient temperature for the production of new cyanopyrroloazepine derivatives in high yields. This catalyst could be used several times in these reactions and have main role in the yield of product. The synthesized cyanopyrroloazepines have NH groups in their structure and for this reason have good antioxidant activity. Also, employing Gram-positive and Gram-negative bacteria in the disk diffusion procedure confirmed some cyanopyrroloazepines antimicrobial effect. The results showed that synthesized cyanopyrroloazepine prevented the bacterial growth. This used process for preparation of new cyanopyrroloazepine has some improvements such as low reaction time, product with high yields, simple separation of catalyst and products.