FeCl<sub>3</sub>/TMSCl:
An Effective Catalytic System for the Conjugate Addition of Sodium <i>p</i>-Toluenesulfinate to α,β-Enones
作者:B. Sreedhar、M. Reddy、P. Reddy
DOI:10.1055/s-2008-1077967
日期:——
A new protocol for the β-sulfonation of α,β-unsaturated carbonyl compounds is described. The method employs FeCl3 as catalyst and TMSCl as additive for conjugate addition of sodium p-toluenesulfinate to enones.
initially the fabrication of a single-atom photocatalyst Ni/TiO2 for the visible-light-induced site-selective sulfonation of enamides to give amidosulfones with 36 examples up to 99% yield. The experimental results show that this single-atom photocatalyst Ni/TiO2 can achieve site-selective sulfonation of enamide to construct α-amidosulfones and β-propionamidosulfones under visible light. Importantly, such
单原子光催化作为一种重要的有机转化策略已受到越来越多的关注,其性能很大程度上取决于催化剂的设计。该方案最初涉及制造单原子光催化剂Ni / TiO 2,用于可见光诱导的酰胺的位点选择性磺化,以产生酰胺化砜,其中36个实例的收率高达99%。实验结果表明,该单原子光催化剂Ni / TiO 2可以在可见光下实现酰胺的定点磺化,从而构建α-酰胺基砜和β-丙酰胺基砜。重要的是,这种基于单原子光催化的合成系统显示出良好的可回收性,高周转数(最多18 963),对官能团的优异耐受性,并且可以容易地按比例放大并具有良好的效率。
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 sulfonylimine by an N‐heterocyclic carbene (NHC) catalyst led to the release of a sulfinic anion, which underwent nucleophilicaddition 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
Enantioselective Sulfonation of Enones with Sulfinates by Thiourea/Tertiary-Amine Catalysis
作者:Guang-xun Li、Jin-zhong Zhao、Si-fan Wang、Ming Yan、Jin-yi Shi
DOI:10.1055/a-2202-0842
日期:——
substrates that could be converted into sulfinic acids by treatment with boric acid. The bifunctional catalyst forms a chiral ion pair with the sulfinic acid and controls the enantioselectivity of the sulfonation through hydrogen bonding.