Method for aqueous-phase synthesizing cyan-substituted styrene compounds

The invention discloses a method for aqueous-phase synthesizing cyan-substituted styrene compounds. The cyan-substituted styrene compounds are synthesized by taking water as a solvent and taking benzyl cyanide and aromatic aldehyde as materials through noevenagel condensation reaction, wherein the aromatic aldehyde is selected from formula shown in the specification. According to the invention, the reaction is carried out at a room temperature; relative to other high-temperature reactions in the prior art, not only is yield improved, but also energy resources are saved, and therefore, the method is beneficial to low-carbon harmless green engineering. White spherical precipitates are generated after reaction and dehydration, and the white spherical precipitates are washed in water to neutral, and dried to obtain a target product; and besides, the method is simple in synthetic steps, easy for treatment and high in yield.