Gallium-mediated allyl transfer from bulky homoallyl alcohol to aldehydes or alkynes: Control of dynamic σ-allylgalliums based on retro-allylation reaction
作者:Sayuri Hayashi、Koji Hirano、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1016/j.jorganchem.2006.08.047
日期:2007.1
reagent and gallium trichloride, bulky homoallyl alcohols undergo gallium-mediated retro-allylation reaction to provide σ-allylgallium reagents. The σ-allylgallium reagents generated were applied to carbonyl allylation. The retro-allylation reaction generates (Z)- and (E)-σ-crotylgalliums stereospecifically, starting from erythro- and threo-homoallyl alcohols, respectively. The stereochemically defined
公开了一种用于制备和控制动态σ-烯丙基镓的新方法。用格氏试剂和三氯化镓处理后,大体积的均烯丙基醇经历镓介导的逆烯丙基化反应,以提供σ-烯丙基镓试剂。将产生的σ-烯丙基镓试剂应用于羰基烯丙基化。逆向烯丙基化反应分别分别从赤型和苏型烯丙基醇开始立体定向地生成(Z)-和(E)-σ-巴豆基镓。立体化学定义的巴豆基镓试剂实现了醛的立体选择性烯丙基化。还描述了炔烃与通过逆烯丙基化制备的烯丙基镓试剂的烯丙基镓化反应。