Synthesis of functionalized ring a building blocks for taxoids
摘要:
The synthesis of a series of oxygenated cyclohexenes 1, 2, 11, 14, 18, and 19 that possess suitable functionality for further elaboration for taxoid synthesis is described. These compounds have been prepared from beta-ionone by a series of oxidative and addition reactions or alternatively by a Lewis acid catalyzed intermolecular Diels-Alder reaction in which the A-ring is constructed directly.