Keywords: Cyclisation / Muscarine / Oxygen heterocycles / Enantioselectivity / Natural products 5-endo-trig cyclisation of the (Z)-hydroxyalkenoate 17 using iodine as the electrophile gave a good yield of the β-hydroxytetrahydrofuran 18, probably via the corresponding iodohydrin. A variety of one-carbon degradation methods were then used to generate precursors to (−)-muscarine (25d). An alternative strategy featured control of a 5-endo-trig iodocyclisation by an allylic hydroxyl group, which can be used for the highly stereocontrolled synthesis of hydroxy-iodote-

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