2-dioxathiolane-2,2-dioxide and 4-(methoxymethyl)-1,3,2-dioxathiolane-2,2-dioxide have been used as ‘epoxide-like’ synthons during the asymmetric alkylation of oxazinone-derived glycine equivalents. Using a fully stereoselectivesynthesis, eight stereoisomers of the spiro derivatives of the glycine equivalents were obtained. The relative configurations of the spiro compounds obtained were easily determined