Chiral Cyclobutanols and Cyclopentane Dimers via Samarium(II) Iodide Induced Keto-Olefin Cyclisations of Carbohydrate-Derived Unsaturated Ketones

[摘要]：Some pentose and hexose Sugars were converted into unsaturated ketone derivatives, which themselves served as substrates for 4-exo-trig radical cyclisation reactions mediated by Sml(2). Depending oil the order of addition of reagents, the keto-olefins Could also be made to undergo a surprising tandem 5-endo-trig cyclisation/dimerisation reaction to a cyclopentane dimer or a cyclobutane monomer.

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