Enantiomerically pure oligo(tetrahydrofurans) 17 and 18 have been prepared using an epoxide cascade reaction. The polyepoxide precursors 13 and 14 were synthesized using the enantiomerically pure epoxyorganolithium reagent 3. Thus, addition of 3 to the THF aldehyde 11 gave alcohol 12 with a high Cram selectivity of 95:5.