ChemInform Abstract: The Application of Intramolecular Radical Cyclizations of Acylsilanes in the Regiospecific Formation of Cyclic Silyl Enol Ethers.

Abstract

The Application of Intramolecular Radical Cyclizations of Acylsilanes in the Regiospecific Formation of Cyclic Silyl Enol Ethers.-Two methods for the regiospecific formation of cyclic silylenol ethers are described. The first starts from α-stannyl bromide or α-stannyl xanthate derivatives and only leads to five-membered rings. The newly formed σ-bond and π-bond are located between the same C-atoms. The second one starts from ω-bromo-α-phenylsulfonylacylsilanes and allows effective preparation of five-and six-membered rings. In this case, the newly formed σ-bond and π-bond are located at adjacent C