Mukaiyama aldol and Michael reactions catalyzed by lanthanide iodides
作者:Nicolas Giuseppone、Pierre Van de Weghe、Mohamed Mellah、Jacqueline Collin
DOI:10.1016/s0040-4020(98)00791-1
日期:1998.10
Samariumdiiodide is an efficient catalyst precursor which allows the formation of condensation products between various carbonylcompounds and ketene silyl acetals or enoxysilanes. With α,β-unsaturated carbonylcompounds, 1,2- or 1,4-additions are observed according to the structure of the substrate. α,β-Unsaturated ketones yield to enoxysilanes by selective Michael additions. Aldol poducts are isolated
Indium-Mediated β-Allylation, β-Propargylation, and β-Allenylation onto α,β-Unsaturated Ketones: Reactions of in-Situ-Generated 3-<i>tert</i>-Butyldimethylsilyloxyalk-2-enylsulfonium Salts with in-Situ-Generated Organoindium Reagents
作者:Kooyeon Lee、Hyunseok Kim、Tomoya Miura、Koichi Kiyota、Hiroyuki Kusama、Sunggak Kim、Nobuharu Iwasawa、Phil Ho Lee
DOI:10.1021/ja035988m
日期:2003.8.1
onium salts, generated in situ from the reaction of alpha,beta-enones with dimethyl sulfide in the presence of TBSOTf, underwent a novel nucleophilic substitution with allylindiums to give silyl enol ethers of delta,epsilon-alkenyl ketones in good yields, which correspond to formal Michael addition products. In a similar manner, 1,4-propargylation of propargylindiums onto the sulfoniumsalts produced
A Novel Nucleophilic Substitution of in Situ Generated 3-<i>tert</i>-Butyldimethyl- silyloxyalk-2-enylsulfonium Salts with Allylindium Reagents
作者:Phil Ho Lee、Kooyeon Lee、Sunggak Kim
DOI:10.1021/ol016542i
日期:2001.10.1
[reaction: see text] In situ generated 3-tert-butyldimethylsilyloxyalk-2-enylsulfonium salts derived from the reaction of alpha,beta-enones with dimethyl sulfide in the presence of TBSOTf undergo a novel nucleophilic substitution with in situ generated allylindium reagents from indium and allyl halides to give silyl enol ethers of delta,epsilon-unsaturated ketones, which correspond to Michael addition