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A series of oxocyclopenta[c]chromenes were synthesized via three component reaction of 4‐hydroxycumarin, dialkyl acetylenedicarboxylate, α‐bromo ketones, and triphenylphosphine in the presence of catalytic amount of Fe3O4 magnetic nanoparticles (MNPs) (15 mol%) under solvent‐free conditions at 70°C. Facile, green, easy separation of product and catalyst, and high yields of products are advantages of these reactions.

Wood ash is a naturally alkaline derived substance containing organic and inorganic constituents. This study investigates the catalytic activity of wood ash as a heterogeneous catalyst for the synthesis of benzochromene derivatives. Several wood ash catalysts, comprising calcium- and potassium-rich carbonates, were prepared from different natural resources under various combustion temperatures. The prepared catalysts were characterized by Fourier transform infrared, scanning electron microscopy, energy dispersive X-ray analysis, transmission electron microscopy, and X-ray diffraction techniques. Catalytic efficiency of the resultant catalysts was tested in the synthesis of benzochromene derivatives. The experimental studies clarified that the catalyst prepared at 850 °C could efficiently expedite the formation of three-component synthesis of benzochromene derivatives in water at 80 °C with high yields. Indeed, alkali, alkaline metal, and metal oxides such as Al2O3, SiO2, MgO, CaO, and Fe2O3, are widely utilized as both catalyst and catalyst support in the heterogeneous catalytic processes. The prepared wood ash catalysts (possessing metal oxides, e.g., CuO, Al2O3, SiO2, and CaO) could effectively prompt the electrophilic activity of the carbonyl groups during the nucleophilic attack intermediate, enhancing the efficiency of the reactions.

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Synthesis of a variety of furanone derivatives is described using multicomponent reaction of 15‐nonacosanole extracted from Fumaria officinalis, electron‐deficient acetylenic compounds, and epoxides in the presence of catalytic amount of nano KF/Clinoptilolite. Aerial parts of F. officinalis were collected from Alborz Mountains (north of Iran) in September 2014. Voucher specimens (2625T) were deposited in the chemistry department of Qaemshahr University in Mazandaran‐Iran.