The vinylogous aldol-type addition of a dienolsilyl ether, derived from 2, 2, 6-trimethyl-4H-1, 3-dioxin-4-one, showed to occur with complete γ-selectivity by enolate activation promoted by neutral Lewis bases under solvent-free conditions. Moderate to high yields were obtained with aromatic, hetero-aromatic, and aliphatic aldehydes, as well as activated ketones. Under the same conditions and in the absence of catalyst, the first Mukaiyama–Michael addition ...
