摘要:
In order to develop an efficient method for the regio- and stereoselective introduction of a carbon substituent, a radical hydrogen abstraction-cyclization using 1- and 2-bromovinylsilyl groups as bifunctional tethers was studied. Although, the selective introduction of a carbon substituent at the position P to the hydroxyl was unsuccessful, a carbon substituent was introduced with the 2-bromovinylsilyl ethers via a hydrogen abstraction-cyclization. These reactions were analyzed based on the bond dissociation energies obtained by theoretical calculations. (c) 2005 Elsevier Ltd. All rights reserved.