The synthesis of a conformationally restrained, combined thromboxane antagonist / synthase inhibitor using an intramolecular ‘Stille’- or ‘Grigg’-palladium-catalysed cyclisation strategy

Abstract

The synthesis of the conformationally restrained analogues 15 and 20, of the combined thromboxane antagonist / synthase inhibitor GR85305, has been achieved using novel intramolecular ‘Stille’- and/or ‘Grigg’-palladium-catalysed cyclisation reactions. A novel free radical cyclisation leading to an eight-membered ring is also described.