Réaction pseudo-multicomposants entre le glutaconate de diméthyle et des aldéhydes aromatiques induite par le bromure de phénylzinc : accès domino à des dihydropyranones 2,3,5-trisubstituées

Phenylzinc bromide enables a pseudo three-component reaction of methyl glutaconate and aromatic aldehydes. Unsaturated trisubstituted δ-valerolactones (dihydropyranones) are obtained in fair to good yields by an aldol/aldol/elimination/lactonization domino process that allows the formation of four new bonds in a single step. A putative reaction mechanism is proposed.