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
Copper‐Catalyzed Transsulfinamidation of Sulfinamides as a Key Step in the Preparation of Sulfonamides and Sulfonimidamides
作者:Hao Yu、Zhen Li、Carsten Bolm
DOI:10.1002/anie.201810548
日期:2018.11.19
sulfinamides are prepared by copper‐catalyzed transsulfinamidation of primary sulfinamides with O‐benzoyl hydroxylamines. Subsequent oxidations of the resulting products lead to the corresponding sulfonamides. Treatment of N‐aryl sulfinamides with O‐benzoyl hydroxylamines under copper catalysis provides N‐aryl sulfonimidamides.
Efficient Synthesis of 3-(Arenesulfinyl)indoles in Water
作者:Y. Liu、Z. Y. Zhang、Y. Z. Ji、H. J. Li、Y. C. Wu
DOI:10.1134/s1070428021050109
日期:2021.5
sulfinylation of indoles with arylsulfinamides in water in the presence of trifluoroacetic acid as a promoter is described. The reaction occurs smoothly at room temperature under environmentally benign conditions without any catalyst, additive, ligand, or organic solvent. The developed sulfoxide synthetic protocol is attractive due to the use of water as the solvent and provides a novel and efficient route to
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