|
چکیده
|
In the presented study, we developed a new and efficient strategy for the synthesis of coumarin-linked nicotinonitrile derivatives via a cooperative vinylogous anomericbased oxidation mechanism. Target compounds were prepared through a four component reaction between aldehyde derivatives, 2-acetyl-3H-benzo[f]chromen-3-one or 3-acetylcoumarin, malononitrile or ethyl cyanoacetate and ammonium acetate, in the presence a catalytic amount of Fe3O4@ SiO2@(CH2)3‐urea‐benzimidazole with sulfonic acid tags as a recoverable nanomagnetic catalyst. All reactions proceed smoothly with good to high yields under solvent free conditions.
|