Copper-Catalyzed Ring-Opening of Heterobicyclic Alkenes with Grignard Reagents: Remarkably High<i>anti</i>-Stereocontrol
作者:Ramón Gómez Arrayás、Juan Carlos Carretero、Silvia Cabrera
DOI:10.1055/s-2006-926379
日期:——
protocols for the ring-opening reaction of heterobicyclic alkenes with carbon nucleophiles which typically occur with syn selectivity, the alkylative ring-opening reaction of [2.2.1]oxa- and azabicyclic alkenes with Grignard reagents in the presence of a catalytic amount of copper(I) takes place with very high or complete anti-stereocontrol under smooth reaction conditions. This new procedure proved to
与大多数报道的杂双环烯烃与碳亲核试剂的开环反应(通常以顺式选择性发生)不同,[2.2.1] 氧杂环和氮杂双环烯烃与格氏试剂的烷基化开环反应在催化量的铜 (I) 在平稳的反应条件下以非常高或完全的反立体控制发生。事实证明,这种新方法适用于格氏试剂和双环烯烃的范围很广。特别值得注意的是低反应性底物如非芳族氧杂双环烯烃和氮杂苯并降冰片二烯在该催化剂体系下的容易开环反应。