Bidentate Hydroxyalkyl NHC Ligands for the Copper-Catalyzed Asymmetric Allylic Substitution of Allyl Phosphates with Grignard Reagents
作者:Magaly Magrez、Yann Le Guen、Olivier Baslé、Christophe Crévisy、Marc Mauduit
DOI:10.1002/chem.201203969
日期:2013.1.21
Demonstrating their potential: Bidentate alkoxy NHC ligands have been used in the copper‐catalyzed asymmetric allylic alkylation of allyl phosphates with Grignard reagents (see scheme). The method provides access to tertiary and quaternary chiral centers with high regio‐ and enantioselectivity. The system is also applied to the synthesis of chiral E,E‐dienes, a key structural motif prevalent in natural
证明其潜力:用格氏试剂在铜催化的烯丙基磷酸的不对称烯丙基烷基化反应中使用了确定的烷氧基NHC配体(参见方案)。该方法可进入具有高区域和对映选择性的三级和四级手性中心。该系统还适用于手性E,E-二烯的合成,手性E,E-二烯是天然产物中普遍存在的关键结构基序。