Abstract

Lewis-acid catalysed ring-opening of functionalised (cyclopropyl)methylstannane 10 , in the presence of aldehydes or ketones, was found to afford the corresponding aldol adducts in high yields. Subsequent lactonisation under acid catalysis led quantitatively to substituted exo-methylene-δ-valerolactones, some of them possessing a unique spirocyclic structure.

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