Bio-inspired asymmetric Zn-N<sub>2</sub>O<sub>2</sub> single-atom catalysts via natural skeleton for efficient N-alkylation of nitroarenes with alcohols.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41786710.
- Also identified by DOI 10.1038/s41467-026-70172-1 and PMC identifier 12963498.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Although significant developments are made in non-noble metal catalysts for N-alkylation of nitroarenes with alcohols via borrowing hydrogen strategy, obtaining catalysts with superior activity, reusability and broad substrate scope under mild reaction conditions remains challenging. Single-atom catalysts (SACs) hold unique coordination/electron structures, to be the potential candidates for this reaction. In this study, we firstly and creatively fabricate bio-inspired Zn SACs with asymmetric Zn-N<sub>2</sub>O<sub>2</sub> sites by utilizing the natural skeleton of biomass chitosan (denoted as Zn/CS), and achieve the first instance of heterogeneous Zn SACs in borrowing hydrogen reaction between nitroarenes and alcohols. The results reveal that the asymmetric Zn-N<sub>2</sub>O<sub>2</sub> sites induced by natural skeleton (like ligands) and nanoporous structure of Zn/CS significantly promote the N-alkylation efficiency of nitroarenes with alcohols. Notably, the Zn/CS exhibits the highest turnover frequency (TOF) among the reported heterogeneous catalysts, as well as wide substrate scope (56 examples) and excellent reusability. Furthermore, the catalytic pathway/mechanism is investigated by combing theoretical calculations, which reveals that the asymmetric Zn-N<sub>2</sub>O<sub>2</sub> sites with electron-deficient character can facilitate the formation of Zn-H and Zn-O bonds between Zn/CS and Ph-CH<sub>2</sub>O<sup>-</sup>, thus easily generating the transition state Ph-CH<sub>2</sub>O* and driving the whole reaction.