Catalyst For Synthesis Of Quinoxalines Research Articles

Application of sulfuric acid modified nano kaolin as a heterogeneous catalyst for the efficient synthesis of quinoxalines and benzothiazines

Kaolin–OSO3H efficiently catalyzes the condensation of 2-aminobenzenethiol or benzene-1,2-diamine and 2-bromo-1-aryl-ethanones to yield quinoxaline and benzothiazine derivatives in good yields. The sulfuric acid modified nano kaolin was synthesized with a simple and low-cost method. The present method also has the advantages of good to excellent yields, short reaction times, operational simplicity, and a natural and green catalyst.

Integration of Pd and Cu on polymer: a powerful bimetallic heterogeneous catalyst for sequential synthesis of quinoxalines

Pd2+/Cu2+ bimetallic catalysts immobilized on ethylenediamine-functionalized poly(vinyl chloride) (PdII/CuII@EDA-PVC) were developed by combining two metallic catalysts that complement rather than inhibit one another. The synthesized PdII/CuII@EDA-PVC were screened for their catalytic activity and found to be excellent in the one-pot sequential synthesis of quinoxalines from 1,2-diphenylacetylenes and o-phenylenediamines. Both Pd2+ and Cu2+ are indispensable and play crucial roles in this transformation. This one-pot sequential reaction proceeds well and tolerates various available substrates to form the desired product in excellent yield. A plausible mechanism was proposed for this conversion.

ChemInform Abstract: Reusable α‐MoO3 Nanobelts Catalyzes the Green and Heterogeneous Condensation of 1,2‐Diamines with Carbonyl Compounds.

Abstractα‐MoO3 nanobelts are prepared and successfully applied as a catalyst for synthesis of quinoxalines and indoles from diamines.

Nano-BF3·SIO2: a reusable and eco-friendly catalyst for synthesis of quinoxalines

2,3-Disubstituted quinoxalines were synthesized via condensation of α-diketones and 1,2-phenylenediamines. Nano-BF3·SiO2 as a "green" and reusable solid acid was used as the catalyst for the synthesis of quinoxalines. The reaction was carried out at room temperature under sonication with high to excellent yields.