Silylene oxonium ylides: di-tert-butylsilylene insertion into C–O bonds
作者:Laura E. Bourque、Pamela A. Haile、Janice M.N. Loy、K.A. Woerpel
DOI:10.1016/j.tet.2009.04.016
日期:2009.7
Allylic ethers undergo insertions of silylenes into C-O bonds to form allylic silanes. Silylene insertion into C-O acetal bonds was also observed. Formation of silylene ylide intermediates led to [ 1,2]-Stevens rearrangement products as well as [2,3]-sigmatropic products depending upon the steric environment of the starting allylic ether. (C) 2009 Elsevier Ltd. All rights reserved.
Metal-Catalyzed Silylene Insertions of Allylic Ethers: Stereoselective Formation of Chiral Allylic Silanes
作者:Laura E. Bourque、Pamela A. Cleary、K. A. Woerpel
DOI:10.1021/ja073758s
日期:2007.10.1
Silylene insertion into allylicethers occurs suprafacially to provide enantioenriched allylic silanes and disilanes. Silylene insertion to a variety of protected allylic alcohols utilizing silver- and copper-mediated conditions proved to be a general method for allylic silane formation. Allylic disilanes reacted similarly to allylic silanes, undergoing both annulation and allylation reactions.
easily removed via visible light irradiation under mild conditions. We found that an excited phenolate-type photocatalyst efficiently transfers an electron to the benzene ring of benzyl-derived protecting groups to generate a phenyl radical anion. The benzyl C–N or C–O bond is then mesolytically cleaved by releasing a benzylradical. This method enables efficient deprotection of the benzyl group on amides