Asymmetric alkene cycloalumination by AlEt3, catalyzed with neomenthylindenyl zirconium η-complexes
作者:Lyudmila V. Parfenova、Pavel V. Kovyazin、Tatyana V. Tyumkina、Tatyana V. Berestova、Leonard M. Khalilov、Usein M. Dzhemilev
DOI:10.1016/j.jorganchem.2012.10.021
日期:2013.1
structures, as well as solvent, affect the overall yield and enantiomeric excess of the reaction product - 3-alkylsubstituted aluminacyclopentanes. The reaction of terminal alkenes with AlEt3, catalyzed by complex 1, in hydrocarbon solvents gives predominantly S-enantiomers of cyclic organoaluminum compounds with enantiomeric excess up to 37%. Complex 2 shows smaller stereoinduction effect and provides
纸张致力于末端烯烃cycloalumination的反应通过ALET研究3(对具有neomenthylindenyl锆络合物催化小号)(对小号) -双[ η 5 - [1 - [(1小号,2小号,5 [R)-2-异丙基-5- methylcycloh-exyl]茚基]二氯化锆(1)或(对小号) - (η 5 -环戊二烯基)[ η 5 - [1 - [(1小号,2小号,5 R)-2-异丙基-5-甲基环己基]茚基]]二氯化锆(2)。结果表明,烯烃和催化剂的结构以及溶剂影响了反应产物3-烷基取代的氧化铝环戊烷的总产率和对映体过量。在烃类溶剂中,末端烯烃与配合物1催化的AlEt 3的反应主要产生环状有机铝化合物的S-对映异构体,其对映体过量最高可达37%。配合物2显示较小的立体诱导作用,并提供具有6–26%ee的氧化铝环戊烷的R对映异构体。 显示了含硒的衍生试剂(R)-2-苯基硒基丙酸对由环状有机铝化合物制得的β-烷基-1