Cycloadditions of Allylsilanes, Part 8.1 Diastereoselective Synthesis of Spirocyclopentanes by Lewis Acid Promoted [3+2] Cycloaddition of Allyltriisopropylsilane and 2-Alkylidenecycloalkan-1-ones

Abstract
The reaction of the titanium tetrachloride complexes of 2-alkylidenecycloalkan-1-ones with allyltriisopropylsilane is highly stereospecific at low temperatures and provides a simple direct access to spirocyclic ring systems. The method is extended to the synthesis of polyspiranes.

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