Copper-Catalyzed Enantioselective Additions to Oxocarbenium Ions: Alkynylation of Isochroman Acetals
作者:Prantik Maity、Harathi D. Srinivas、Mary P. Watson
DOI:10.1021/ja207585p
日期:2011.11.2
developed an enantioselective, copper(I)-catalyzed addition of terminal alkynes to racemic isochroman acetals. This method is one of the first transition-metal-catalyzed approaches to enantioselective additions to prochiral oxocarbenium ions. In this reaction, TMSOTf is used to form the oxocarbenium ion in situ under conditions compatible with simultaneous formation of the chiral copper acetylide. By
我们开发了一种对映选择性、铜 (I) 催化的末端炔烃与外消旋异色满缩醛的加成。该方法是第一种对前手性氧代碳鎓离子进行对映选择性加成的过渡金属催化方法。在该反应中,TMSOTf 用于在与同时形成手性铜乙炔化物相容的条件下原位形成氧碳鎓离子。通过使用双(恶唑啉)配体,可以观察到各种富含对映体的 1-炔基异色满的良好产率和对映选择性。