The synthesis of allylic sulfoximines 3 and 4 is described. The conjugate addition reactions of lithiated 4 with cyclic and acyclic Michael acceptors gives mainly 1,4-γ and 1,4-α adducts respectively in THF and 1,4-α and 1,4-γ adducts respectively in HMPA/THF. The reaction of lithiated 4 and benzaldehyde gives only 1,2-α adducts in THF, however 1,2-α and 1,2-γ adducts were isolated when HMPA/THF was employed as solvent. Benzophenone gave only the 1,2-γ adduct. © 1993.