two-step procedure, were converted into [1,4]dithiepino[2,3-b]furans 5 by the addition of lithiated 1,3-dithiane and subsequent aqueous workup underacidicconditions. In case of bis(imine) 6, the isolation of the intermediate bis(aziridinyl alcohol) 7 was possible and resulted from an aza-Payne rearrangement. Acid treatment of 7 led to the bis(furan) 8. According to quantum chemical calculations, the