Samarium diiodide mediated intramolecular cyclisation of mixed enone–enoate systems: a simple preparation of spirocyclic ethers

Samarium(II) diiodide mediated intramolecular cyclisation of mixed enone–enoate substrates in THF/MeOH is described. Spirocyclic ethers are obtained, and the stereodefined preparation of 1-oxaspiro[4.4]nonan-7-one products is included.

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