The alkylation of Karady/Seebach oxazolidinone enolates with epoxides, promoted by 2.1 equivalents of diethylaluminum chloride, furnishes ring-opened adducts in moderate-to-good yields with high diastereoselectivity. The method provides an effective approach to uncoded homoserine analogs and expands the utility of readily available oxazolidinones in asymmetric synthesis.