PET-Oxidative cyclization of unsaturated silyl enol ethers. Regioselective control by solvent effects
作者:Sandra Hintz、Roland Fröhlich、Jochen Mattay
DOI:10.1016/0040-4039(96)01708-x
日期:1996.10
Monocyclic silyl enol ethers tethered to an olefinic or a silylacetylenic side chain are irradiated in the presence of the electrontransfer sensitizer 9,10-dicyanoanthracene (DCA). Cyclization of the initially formed silyloxy radical cations efficiently provides bicyclic and tricyclic ketones with definite stereochemistry. The regiochemistry of the cyclization step can be controlled by addition of