Stereospecific α-methallylation of hydroxyaldehydes by silatropic ene cyclisation
作者:Jeremy Robertson、Michael J. Hall、Stuart P. Green
DOI:10.1016/j.tet.2009.01.117
日期:2009.7
We describe the thermal rearrangement of aldehydes bearing an alpha-(allyl- or crotylsilyl)oxy substituent. The transformations are best described mechanistically as intramolecular silatropic ene reactions based on stereoselectivity, kinetic and computed transition state data. The overall process constitutes a stereospecific (meth)allylation of alpha-hydroxyaldehydes, under neutral conditions, in which the hydroxyl protecting group is also the (meth)allylating agent. (C) 2009 Elsevier Ltd. All rights reserved.
Stereospecificity in the silicon tethered α-(methyl)allylation of aldehydes
作者:Jeremy Robertson、Michael J. Hall、Stuart P. Green
DOI:10.1039/b306920f
日期:——
Heating E- and Z-crotyl(diphenyl)silyloxy aldehydes, in the absence of an added catalyst, results in stereospecific intramolecular allyl transfer with moderate to high stereoselectivity.