How is (3S)-N,N-Dimethyl-3-pyrrolidinamine dihydrochloride (CAS: 144043-20-9) typically synthesized?

(3S)-N,N-Dimethyl-3-pyrrolidinamine dihydrochloride can be synthesized by the reaction of 3-pyrrolidinamine with hydrochloric acid. Commonly, the 3-pyrrolidinamine is dissolved in an appropriate solvent, and hydrochloric acid is added under controlled conditions to form the dihydrochloride salt. The reaction is typically carried out under mild conditions to maintain the purity of the product.