Organolithium-induced alkylative ring opening of N-sulfonyl-protected aziridinyl ethers is described. The reactions were efficiently carried out with a variety of organolithiums, providing a promising new strategy to unsaturated amino alcohols and ethers. Cis-and trans- 1, 4-dimethoxybut-2-ene-derived aziridines were prepared, and their propensity to undergo organolithium-induced alkylative desymmetrization is detailed. Use of a single enantiomer ...