Abstract
AbstractA selection of 4‐hydroxycyclopent‐2‐enone derivatives were prepared in enantiomerically pure form, and their photochemical [2+2] cycloaddition reactions with a variety of alkenes were studied, with a view to providing diversely functionalized bicyclo[3.2.0]heptanes. Intermolecular reactions provided the target structures in reasonable yields as a mixture of exo and endo adducts, in proportions which varied very little as a function of the steric bulk of the reactants or the reaction conditions. The system was suitably adapted for an intramolecular reaction, which provided a single, stereochemically pure product, the convenient precursor of a rigid, concave, trioxygenated skeleton. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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