put N,N-dimethylmalondiamine into the reaction kettle, add dichloromethane, stir and dissolve, cool to 8 ℃, add p-decylbenzenesulfonyl chloride dropwise, stir and react at room temperature for 4 h, then add 10% sodium pudding aqueous solution to neutralize hydrogen chloride. Stir for 20 min, divide the water, evaporate dichloromethane and evaporate unreacted amine under reduced pressure to obtain N,N-dimethyl-N'-p-decadyl benzenesulfonyl ethylenediamine. Slowly add propiolactone sulfinate under stirring. After dropping, react at 80 ℃ for 4 h, evaporate solvent to obtain crude product, and recrystallize with 70% ethanol to obtain white solid.