Functionalised Allylsilanes from Silylcopper Reagents and Allene. A Useful Strategy for Cyclopentane Annulations
作者:Asuncion Barbero、Carlos Garcı&#x;a、Francisco J. Pulido
DOI:10.1016/s0040-4020(00)00129-0
日期:2000.4
allylsilane-containing divinyl ketones and oxoallylsilanes, respectively. They undergo highly stereocontrolled silicon-assisted intramolecular cyclizations when treated with protic or Lewis acid leading to cyclopentane ring-formation.
New findings on the regiochemistry of the silylcupration of allene
作者:Francisco J. Blanco、Purificacion Cuadrado、Ana M. González、Francisco J. Pulido、Ian Fleming
DOI:10.1016/s0040-4039(00)78523-6
日期:1994.11
Allene 1 reacts at −40 °C with the phenyldimethylsilylcopper reagent 6, with the opposite regioselectivity to that shown by the corresponding silylcuprate reagent 2, to give allylsilanes 7 and 10–15 rather than vinylsilanes.
Mercurinium ion mediated ring expansion of 1- alkenyl-1-cycloalkanols
作者:Sunggak Kim、Kee Han Uh
DOI:10.1016/s0040-4039(00)74251-1
日期:1992.7
TMS ethers of 1-alkenyl-1-cycloalkanols readily rearranged to the ring expanded β-mercurio cycloalkanones via mercurinium ions, which could be converted into α-methylene cycloalkanones through elimination and further one carbon expanded cycloalkanones via free radical chain reactions.
Carbocyclization of unsaturated thioesters under palladium catalysis
作者:Arun P. Thottumkara、Toshiki Kurokawa、J. Du Bois
DOI:10.1039/c3sc50486g
日期:——
reaction for the preparation of cyclic ketone structures from unsaturated thioesters is described. This method capitalizes on the unique reactivity of thioesters with low-valent palladium catalysts and copper(I) salts to form acyl-metal species. Trapping of such intermediates with alkene functional groups generates the corresponding exo-methylene cycloalkanone products. Unsaturated thioester substrates