Abstract
The authors describe a catalytic system for asymmetric vinylogous aldol addition and an unprecedented asymmetric bisvinylogous aldol addition, furnishing ε-siloxy α,β,δ,γ-unsaturated esters in high yield and selectivity. The system employs a pre-Lewis acidic disulfonimide catalyst that has previously been applied to the asymmetric Mukaiyama aldol reaction.
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