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 sulfonium salts produced
3-叔丁基二甲基甲硅烷氧基烷-2-烯基锍盐,在 TBSOTf 存在下由 α,β-烯酮与二甲硫醚反应原位生成,与烯丙基进行新型亲核取代,得到 δ,ε-烯基的甲硅烷基烯醇醚酮产率良好,对应于正式的迈克尔加成产物。以类似的方式,炔丙基鎓在锍盐上的 1,4-炔丙基化以良好的产率产生相应的 δ,ε-炔基酮的甲硅烷基烯醇醚。衍生自γ-取代的炔丙基溴和铟的有机铟试剂以良好的产率提供相应的β-烯基酮的甲硅烷基烯醇醚。该反应通过涉及形成烯丙基锍盐的加成取代机制进行。