Reaction of 1-benzyl-2,5-dicyanopyrrolidine with alkyl halides give unsymmetrical 2,5-dialkylated products (3) in high yields. Hydrolysis of 3 gives γ-diketones which serve as precursors for jasmone analogues having a cyclopentenone framework, while decyanation and debenzylation of 3 lead to 2,5-dialkylpyrrolidine alkaloids in high yields.