Copper-Catalyzed Asymmetric Conjugate Addition of Dimethylzinc to Acyl-<i>N</i>
-methylimidazole Michael Acceptors: Scope, Limitations and Iterative Reactions
作者:Sammy Drissi-Amraoui、Thibault E. Schmid、Jimmy Lauberteaux、Christophe Crévisy、Olivier Baslé、Renata Marcia de Figueiredo、Stéphanie Halbert、Hélène Gérard、Marc Mauduit、Jean-Marc Campagne
DOI:10.1002/adsc.201600458
日期:2016.7.28
An efficient copper‐catalyzed enantioselective conjugate addition of dimethylzinc to unsaturated 2‐acyl‐N‐methylimidazoles has been achieved using a chiral bidentate hydroxyalkyl‐NHC ligand. The reactions proceed with excellent regioselectivity (1,4 vs. 1,6 and 1,8) in extended conjugated systems to afford the 1,4‐adducts in high enantioselectivities. This regioselectivity could be ascertained by DFT
使用手性双齿羟烷基-NHC配体,可将二甲基锌高效地铜催化对映选择性共轭加成至不饱和2-酰基-N-甲基咪唑。在扩展的共轭体系中,反应以极好的区域选择性(1,4与1,6和1,8)进行,从而得到高对映选择性的1,4-加合物。这种区域选择性可以通过DFT研究确定,该研究突出了咪唑环的关键作用。由于开发了可再生不饱和2-酰基-N-甲基咪唑部分的有效方案,最终开发出了一种迭代方法,从而产生了3,5,7个全合成或抗反聚脱氧丙酸酯立体二位体。