high-yielding methodology for the asymmetricsynthesis of 2-(1,3-dioxolan-4-yl)piperidines is described. This approach involves a highly stereoselective addition of vinylmagnesium bromide to N-(3-butenyl)imines derived from D-glyceraldehyde diphenyl ketal and a ring-closing metathesis reaction as key steps. This procedure was used for the first asymmetricsynthesis of (S)-2-[(S)-2,2-diphenyl-1,3-di