Cu(II)/citric acid grafted to chitosan by dendritic units of melamine as a novel and highly efficient heterogeneous catalyst for the synthesis of 2-aminobenzothiazole derivatives

• Published in: Colloid and interface science communications 2023-05, Vol.54, p.100711, Article 100711
• Main Authors: Fattahi, Babak, Dekamin, Mohammad G.
• Format: Article
• Language: English
• Subjects: 2-aminobenzothiazole derivatives; Bio-based nanocomposite; Chitosan; Dendritic catalyst; Green and sustainable chemistry
• ISSN: 2215-0382; 2215-0382
• DOI: 10.1016/j.colcom.2023.100711

In this paper, a new cross-linked chitosan by G1 dendrimer from melamine terminated by citric acid groups to support Cu(II) nanoparticles (CS@CA-Me-CA@Cu) was designed and prepared. Subsequently, the prepared nanocomposite was characterized using different spectroscopic, microscopic and analytical techniques such as FTIR, XRD, FESEM, TGA and EDX. The supramolecular CS@CA-Me-CA@Cu demonstrates higher thermal and chemical stability than its components. In addition, in order to investigate the catalytic performance of the CS@CA-Me-CA@Cu bio-based nanocomposite it was used, as a Lewis acidic and green heterogeneous catalyst, for the preparation of 2-aminobenzothiazole derivatives under green conditions. Also, other advantages of this new bio-based nanocomposite include easy preparation, high catalytic activity, recyclability, and reuse with a gradual decreasing in its catalytic activity. [Display omitted] •A novel catalyst using chitosan by G1 dendrimer from melamine terminated by citric acid molecules to support Cu(II) was prepared.•The use of CS@CA-Me-CA@Cu bio-based catalyst for the synthesis of Riluzole derivatives under green conditions.•The CS@CA-Me-CA@Cu biocatalyst has appropriate chemical, thermal and mechanical stability under optimized conditions.•The recycled CS@CA-Me-CA@Cu biocatalyst was reused up to five times with a gradual decreasing of its catalytic activity.