Abstract
A simple, efficient, and eco-friendly process for the Knoevenagel condensation between various aromatic aldehydes and active methylene compounds and the synthesis of 2-amino-4H-chromene derivatives via a multi-component reaction of various aromatic aldehydes, malononitrile, and resorcinol catalyzed by mono-ammonium phosphate fertilizer (MAP) modified by cadmium chloride (CdCl2) is described. This synthesis procedure is considered an attractive method due to its excellent yields, short reaction time, green conditions, cost-effectiveness, use of a non-toxic solvent, non-chromatographic purification of products, and recyclability of the catalyst.
Graphical abstract
A simple, efficient, and ecofriendly process is proposed to synthesize 2-amino-4H-chromene and 2-(4-chlorobenzylidene) malononitrile derivatives via the application of cadmium pyrophosphate (Cd2P2O7) as catalyst prepared from the modification of mono-ammonium phosphate fertilizer (MAP) by adding cadmium chloride (CdCl2). The products were obtained with good yields in a short reaction time.
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Chehab, S., Merroun, Y., Elhallaoui, A. et al. Catalytic performance of cadmium pyrophosphate in the knoevenagel condensation and one-pot multi-component reaction of chromene derivatives. J Chem Sci 135, 95 (2023). https://doi.org/10.1007/s12039-023-02213-x
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DOI: https://doi.org/10.1007/s12039-023-02213-x