W(CO)<sub>5</sub>(L)-Catalyzed Endo-Selective Cyclization of Allenyl Silyl Enol Ethers: An Efficient Method for the Cyclopentene Annulation onto α,β-Unsaturated Ketones
作者:Tomoya Miura、Koichi Kiyota、Hiroyuki Kusama、Kooyeon Lee、Hyunseok Kim、Sunggak Kim、Phil Ho Lee、Nobuharu Iwasawa
DOI:10.1021/ol034365a
日期:2003.5.1
undergo W(CO)(5)(L)-catalyzed 5-endo cyclization to give the corresponding cyclopentene derivatives in good yield. Furthermore, this novel W(CO)(5)(L)-catalyzed cyclization of allenyl silylenolethers proceeds in a 6-endo manner when 5-siloxy-1,2,5-trienes are employed as a substrate. In these reactions, effective electrophilic activation of allenyl compounds for attack by silylenolethers is achieved
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