Stereoselective synthesis of conjugated α-Z/γ-E and α-Z/γ-Z dienoic acids. Kinetic torquoselectivity versus thermodynamic control†
Abstract
The stereoselective synthesis of conjugated (α-Z/γ-E)-(α-Z/γ-Z)-dienoic acids 4 and 4′ is described. It is based on the regio- and stereoselective addition of Grignard reagents to methylcoumalate. The origin of the stereocontrol is discussed.