Chiral dienolate chemistry in remote asymmetric induction: the allylation / cope rearrangement sequence leading to γ-chiral α, β-unsaturated acid derivatives
allylation of the dienolate derived from the chiral α, β- or β, γ-unsaturated imidefollowed by the Cope rearrangement is shown to effect the net remote asymmetricinduction to create a new chirality of either configuration at the γ-position in high % de. The utility of this approach is shown in the asymmetric synthesis of the C6 side chain of Zaragozic acid A.