Unprecedented McMurry Reactions with Acylsilanes: Enedisilane Formation versus Brook Rearrangement
作者:Alois Fürstner、Günter Seidel、Barbara Gabor、Carsten Kopiske、Carl Krüger、Richard Mynott
DOI:10.1016/0040-4020(95)00482-n
日期:1995.8
The first inter- and intramolecular McMurry reactions of aroyltrimethylsilanes to substituted 1,2-bis(trimethylsilyl)ethene derivatives 2a-c and 7 are described. A low-valent titanium reagent prepared by the reduction of TiCl3 with Na on inorganic supports (Al2O3, NaCl, TiO2) turned out to be best suited. Depending on the reaction conditions and on the particular substitution patterns of the substrates
描述了芳基三甲基硅烷与取代的1,2-双(三甲基甲硅烷基)乙烯衍生物2a-c和7的第一分子间和分子内McMurry反应。事实证明,通过在无机载体(Al 2 O 3,NaCl,TiO 2)上用Na还原TiCl 3制备的低价钛试剂是最合适的。根据反应条件和底物的特定取代方式,导致形成C,O-二甲硅烷基烯醇醚的中间体1,2-二甲硅烷基化的1,2-二醇钛酸酯的Brook重排可能与McMurry竞争脱氧途径。