Tricks of the trade: Because intramolecular Cu-catalyzed access to bicyclo[4.2.0]octanes is not feasible, an oxygen bridge was introduced to facilitate the [2+2] photocycloaddition. Starting from compounds similar to 1, products such as 2 could be obtained enantioselectiviely in three steps after ring-opening metathesis (see scheme).

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http://dx.doi.org/10.1002/chem.201302882DOI Listing

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