Synthesis and PET oxidative cyclization of silyl enol ethers: build-up of quasi-steroidal carbocycles
作者:Jens O Bunte、Stefanie Rinne、Christian Schäfer、Beate Neumann、Hans-Georg Stammler、Jochen Mattay
DOI:10.1016/s0040-4039(02)02491-7
日期:2003.1
PET oxidative cyclization of silyl enol ethers carrying suitable side chains with olefinic double bonds results in the stereoselective formation of carbocycles. Two model compounds for investigating the influence of silyl enol ether ring size are synthesized. Furthermore the synthesis of a quasi-steroidal carbocycle with an unnatural configuration is presented.
Cyclizations of Silyl Enol Ether Radical Cations− The Cause of the Stereoselectivity
作者:Jens O. Bunte、Eike K. Heilmann、Birka Hein、Jochen Mattay
DOI:10.1002/ejoc.200400128
日期:2004.8
(PET) activation of silylenolethers for the synthesis of tricyclic hydrocarbons. The mechanism of this reaction was investigated by conducting independent radical-induced cyclizations of corresponding iodo ketones and performing density functional theory (DFT) calculations on the possible intermediates. Our aim was to explain the nature of the reactive intermediate of the cyclization step and to find