Method for synthesizing chain-like polyamine compound from single primary amine

The invention discloses a method for synthesizing a chain-like polyamine compound from primary monoamine, which comprises the following steps: carrying out addition reaction on 2-decahydronaphthylamine and acrylonitrile, and then carrying out hydrogenation reaction with hydrogen in the presence of a palladium-carbon catalyst and ethanol. The raw materials used in the invention are free of strong acid and strong alkali, have no chemical corrosion to reaction equipment, and do not need to upgrade materials to increase equipment investment; the used solvent is ethanol, and can be recycled through reduced pressure distillation after the reaction is completed, so that the generation of waste liquid is effectively avoided; the reaction process is simple. The method has the advantages that the method is simple to operate, the next step can be directly carried out after each reaction is completed, and the N1-(3-aminopropyl)-N3-decahydronaphthalene-2-propane-1, 3-diamine can be obtained only by carrying out reduced pr