A concise and efficient one-pot sequential approach for the synthesis of modified isoflavone was developed from a reaction of 3-formylchromones, malononitrile, various α,α-dicyanoolefines, using Et 3 N as the base, and EtOH as the solvent, in good yield. The value of this method lies in its short reaction time, convenient purification, no need for a metal catalyst, excellent efficiency, and green solvent. This synthesis involves a Knoevenagel condensation/carbanion formation/ring closure, and finally, an elimination to obtain the respective isoflavonoid derivatives.