Introduction of Electrophiles to the α-Position of α,β-Unsaturated Aldehydes and Ketones by Sequential Conjugate Aminosilylation-Alkylation-Deamination
Silylamines add to α,β-unsaturated aldehydes and ketones in 1,4-addition mode to generate amino-substituted silyl enolethers without any catalysts. These easily isolable silyl enolethers react with acetals and aldehydes in the presence of a Lewisacid to give α-alkoxyalkyl and α-hydroxyalkyl substitutedα,β-unsaturatedcarbonylcompounds, respectively, after deamination by treatment with silica gel