Catalytic Enantioselective Oxidation of Bulky Alkyl Aryl Thioethers with H2O2 over Titanium-Salan Catalysts
作者:Konstantin P. Bryliakov、Evgenii P. Talsi
DOI:10.1002/ejoc.201100557
日期:2011.8
procedure for the oxidation of bulky (preferably aryl benzyl substituted) thioethers with hydrogen peroxide in good to high yields and enantioselectivities (up to 98.5 % ee) is reported. The high optical yields are achieved in a tandem stereoconvergent enantioselective oxidation and kinetic resolution process. A reasonable balance between the sulfoxide yield and enantioselectivity could be found by varying
Reusable BNPs-SiO<sub>2</sub>
@(CH<sub>2</sub>
)<sub>3</sub>
NHSO<sub>3</sub>
H-catalysed selective oxidation of sulfides to sulfones
作者:Kiumars Bahrami、Minoo Khodamorady
DOI:10.1002/aoc.4553
日期:2018.12
(BNPs‐SiO2@(CH2)3NHSO3H) was found to be an efficient heterogeneous nanocatalyst for the selective oxidation of sulfides to sulfones in the presence of H2O2. Excellent yields, easy and quick isolation of products, short reaction times and excellent selectivity are the main advantages of this method. The catalyst was characterized using Fourier transform infrared spectroscopy, energy‐dispersive X‐ray analysis, X‐ray
Synthesis of sulfone derivatives via palladium-catalyzed cross-coupling of benzyl trimethylammonium triflates and sulfonyl hydrazides
作者:Juelin Wan、Weijie Yu、Tao Wang、Jin Luo
DOI:10.1080/10426507.2021.2016758
日期:2022.7.3
Abstract A palladium-catalyzedcross-coupling of benzyl trimethylammonium triflates and sulfonyl hydrazides for the synthesis of various benzyl sulfones is reported. This novel protocol shows widespread functional group tolerance, leading to the desired sulfones in moderate to excellent yields.
A general and practical sulfonylation of benzylic ammonium salts with sulfonyl hydrazides for the synthesis of sulfones
作者:Haibo Zhu、Yingying Zhang、Yishuai Liu、Liu Yang、Zongbo Xie、Guofang Jiang、Zhang-Gao Le
DOI:10.1016/j.tetlet.2020.151975
日期:2020.6
transition-metal-free cross-coupling of sulfonyl hydrazides with benzyl ammonium salts has been developed to synthesize benzyl sulfones using Cs2CO3 as base under mild conditions. The protocol employs stable and easy to handle coupling partners, and is endowed with good substrate compatibility, leading to functional benzyl sulfones in good yields.
已经开发出一种实用且有效的方法,该方法采用磺酰肼与苄基铵盐的无过渡金属交叉偶联,以Cs 2 CO 3为碱,在温和条件下合成苄基砜。该方案使用稳定且易于操作的偶联伙伴,并具有良好的底物相容性,从而可以高收率生产功能性苄砜。
Cobalt‐Catalyzed Redox‐Neutral Sulfonylative Coupling from (Hetero)aryl Boronic Acids, Ammonium Salts and Potassium Metabisulfite
作者:Yingying Zhang、Haibo Zhu、Qiangwen Fan、Liu Yang、Zongbo Xie、Zhang‐Gao Le
DOI:10.1002/cctc.202101716
日期:2022.2.8
redox-neutral sulfonylative coupling of boronic acids and ammonium salts to afford (hetero)aryl alkyl sulfones by using potassium metabisulfite has been realized. Various functional sulfones were obtained by using commercially available and air-stable CoCl2 in combination with phenanthroline ligand. In addition, various carbon based electrophiles, including diaryliodoniumsalts, heteroaryl halides, and