Aromatic amines and (hetero)arenes, such as indoles and pyrroles, are regioselectively sulfinylated under mild aerobic conditions using nitrosoarenes as a redox-catalyst. The nitrosoarene is involved in the electron transfer process with arenes to generate a crucial arene radical cation intermediate for C-H sulfinylation. The present methodology requires no directing group, can be scaled up easily
time-controlled highly selective C3- or C2-sulfinylation of pyrroles with sulfinamides is reported for the first time. The sulfinylation of indoles with sulfinamides using this protocol is oxidant-free and can be performed under obviously more feasible conditions (1.2 equiv. of indoles, 10 min) in comparison with the precedent procedure (3–20 equiv. of indoles, 16–18 h, ammonium persulfate as oxidant, hv). A
Transition‐Metal‐Free Electrophilic Fluoroalkanesulfinylation of Electron‐Rich (Het)Arenes with Fluoroalkyl Heteroaryl Sulfones via C(Het)−S and S=O Bond Cleavage
作者:Jun Wei、Kun Bao、Chengcheng Qi、Yao Liu、Chuanfa Ni、Rong Sheng、Jinbo Hu
DOI:10.1002/adsc.201900959
日期:2019.12.17
A novel Ph2P(O)Cl‐mediated direct fluoroalkanesulfinylation of electron‐rich (het)arenes using fluoroalkylheteroarylsulfones as the RfSO source (Rf=C4F9, CF2Cl, CF2Br, and CF2COOEt) was developed. This is the first example where 2‐HetSO2Rf performs as the RfSO synthon in organic synthesis via both C(Het)−S and S=Obondcleavage.
使用氟代烷基杂芳基砜作为R f SO源(R f = C 4 F 9,CF 2 Cl,CF 2 Br和CF )的新型Ph 2 P(O)Cl介导的富电子(杂)芳烃的直接氟代烷烃亚磺酰化2 COOEt)的开发。这是第一个例子,其中2-HetSO 2 R f通过C(Het)-S和S = O键断裂在有机合成中充当R f SO合成子。
Dramatic Influence of Ionic Liquid and Ultrasound Irradiation on the Electrophilic Sulfinylation of Aromatic Compounds by Sulfinic Esters
The sulfinylation reaction of aromatic and hetero-aromatic compounds with sulfinic esters as electrophiles has been investigated in different ionic liquids and by means of different Lewis acid salts in order to get moderate to good yields of asymmetrical sulfoxides. Mixtures of 1-butyl-3-methylimidazolium chloride and aluminum chloride were found to be the most efficient and recyclable reaction framework
Visible-Light-Accelerated C−H Sulfinylation of Heteroarenes
作者:Andreas Uwe Meyer、Alexander Wimmer、Burkhard König
DOI:10.1002/anie.201610210
日期:2017.1.2
Heteroaromatic sulfoxides are a frequent structural motif in natural products, drugs, catalysts, and materials. We report a metal‐free visible‐light‐accelerated synthesis of heteroaromatic sulfoxides from sulfinamides and peroxodisulfate. The reaction proceeds at room temperature with blue‐light irradiation and allows the C−H sulfinylation of electron‐rich heteroarenes, such as pyrroles and indoles