Copper‐Catalyzed Asymmetric Conjugate Addition of Dimethylzinc to Acyl‐
<i>N</i>
‐methylimidazole Michael Acceptors: a Powerful Synthetic Platform
作者:Sammy Drissi‐Amraoui、Marie S. T. Morin、Christophe Crévisy、Olivier Baslé、Renata Marcia de Figueiredo、Marc Mauduit、Jean‐Marc Campagne
DOI:10.1002/anie.201506189
日期:2015.9.28
An efficient copper‐catalyzed enantioselective conjugate addition of dimethylzinc to α,β‐ and α,β,γ,δ‐unsaturated 2‐acyl‐N‐methylimidazoles has been achieved using a chiral bidentate hydroxyalkyl‐NHC ligand. The reactions proceeded with both excellent regio‐ and enantioselectivity (14 examples, 87–95 % ee) to afford the desired 1,4‐adducts, which were easily transformed to the corresponding aldehydes
使用手性双齿羟基烷基-NHC配体可实现高效的铜催化对映选择性共轭二甲基锌加成到α,β-和α,β,γ,δ-不饱和2-酰基-N-甲基咪唑。反应进行时具有出色的区域选择性和对映体选择性(14个实例,87-95%ee),得到所需的1,4-加合物,可轻松转化为相应的醛,酯和酮。因此,这种功能强大的方法因此成功地应用于天然产物的合成中。此外,还公开了一种迭代过程,该过程导致了非常理想的1,3--去氧丙酸酯骨架(高达94%de)。