Abstract
The inherent high degree of chemoselectivity shown by the allylsilane-acetals 4,4-dimethoxy-2-trimethylsilylmethyl-1-butene (3) and 5,5-dimethoxy-2-trimethylsilylmethyl-1-pentene (4), upon reaction with O-silylated enolates and a Lewis acid, allows a simple one-pot synthesis of the [4.5], [4.6], [5.5] and [5.6] spirocyclic ring systems as well as six- and seven-membered rings containing a quaternary centre.
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