Enantioselective Sulfonation of Enones with Sulfonyl Imines by Cooperative N-Heterocyclic-Carbene/Thiourea/Tertiary-Amine Multicatalysis
作者:Zhichao Jin、Jianfeng Xu、Song Yang、Bao-An Song、Yonggui Robin Chi
DOI:10.1002/anie.201305023
日期:2013.11.18
make light work: In an organocatalytic asymmetric sulfonation of enones, the activation of a sulfonyl imine by an N‐heterocyclic carbene (NHC) catalyst led to the release of a sulfinic anion, which underwent nucleophilic addition to the enone. The enantioselectivity of the process was controlled by a chiral thiourea/amine co‐catalyst through anion recognition and hydrogen‐bonding interactions. Tol=p‐tolyl
许多手轻而易举:在烯酮的有机催化不对称磺化中,N-杂环卡宾(NHC)催化剂对磺酰基亚胺的活化导致亚砜阴离子的释放,该亚砜阴离子经过亲核加成后成为烯酮。该过程的对映选择性是通过手性硫脲/胺助催化剂通过阴离子识别和氢键相互作用来控制的。Tol = p-甲苯基。