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A catalyst-free and solvent-free three-component tandem strategy for synthesizing tetrahydrobenzo[ b ]pyran scaffolds  through  Knoevenagel–Michael cyclocondensation is reported using visible light irradiation as a green promoter at room temperature. The prominent benefits of the existing protocol are catalyst-free, solvent-free, using commercially accessible, inexpensive preliminary substances, operational simplicity, energy-effectiveness, great yields, high atom-economy, thus meeting some features of sustainability and green chemistry.

Catalyst-Free and Solvent-Free Visible Light Assisted Synthesis of Tetrahydrobenzo[ b ]Pyran Scaffolds at Room Temperature