Sustainable Synthesis of Quinoxaline Derivatives

Quinoxaline derivatives represent a versatile class of nitrogen-containing heterocycles with broad applications across pharmaceuticals, agrochemicals and materials science. Their synthesis traditionally relies on condensation of o-phenylenediamines with 1,2-dicarbonyl compounds under conditions that often employ toxic solvents, precious metal catalysts and multi-step procedures. In recent years, sustainable synthetic strategies have aimed to minimise environmental impact by adopting green chemistry principles. These include one-pot protocols that enhance atom economy, metal-free and organocatalytic routes that avoid hazardous metals, and the deployment of reusable heterogeneous catalysts or nano-catalysts to facilitate milder reaction conditions and simplified separation. Alternative energy inputs such as microwave irradiation and ultrasound have been applied to accelerate reaction rates while reducing energy consumption. The utilisation of renewable feedstocks, notably biomass-derived carbohydrates, coupled with hydrothermal or continuous-flow processes, further exemplifies the drive towards circular and resource-efficient quinoxaline production. Advances in catalyst design—from functionalised clays and solid acids to nanostructured pyrophosphates—have yielded protocols combining high yields with facile catalyst recovery and low E-factors. Collectively, these developments underscore a global trend to align the synthesis of quinoxaline frameworks with sustainability benchmarks, offering scalable routes that meet both industrial performance and environmental stewardship.

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Sustainable Synthesis of Quinoxaline Derivatives publication trend

The graph below shows the total number of articles in sustainable synthesis of quinoxaline derivatives across all publications each year (not limited to Nature Index journals).

Technical terms

Quinoxaline: A bicyclic heteroaromatic compound consisting of a benzene ring fused to a pyrazine ring.

Nano-catalyst: A catalyst composed of nanoscale materials that offers high surface area, enhanced reactivity and improved recyclability.

Biomass-derived carbohydrates: Sugars and related compounds obtained from renewable biological resources, used as sustainable feedstocks.

E-factor: A quantitative measure of waste generated per unit mass of product in a chemical process.

Heterogeneous catalysis: Catalytic processes in which the catalyst and reactants exist in different phases, facilitating separation and reuse.

References

1. Reusable nano-catalyzed green protocols for the synthesis of quinoxalines: an overview. RSC Advances (2023).
2. Sustainable production of value-added N-heterocycles from biomass-derived carbohydrates via spontaneous self-engineering. National Science Open (2023).
3. Eco-friendly approach to access of quinoxaline derivatives using nanostructured pyrophosphate Na2PdP2O7 as a new, efficient and reusable heterogeneous catalyst. BMC Chemistry (2020).