Preparation of optically active ortho-chloro- and ortho-bromophenyl sulfoxides
摘要:
The preparation of the diastereomerically pure menthyl (S)-2-chloro- and (S)-2-bromophenyl sulfinates by esterification of the corresponding sulfinic acids with ( 1 R,2S,5R)- (-)-menthol and recrystallization/epimerization is reported. The two sulfinates have been converted into enantiomerically pure aryl, vinyl and alkyl sulfoxides by reaction with organomagnesium reagents. These sulfoxides are useful chiral auxiliaries to control the stereochemical outcome of radical reactions. (C) 1999 Elsevier Science Ltd. Ail rights reserved.
By visible-light photoredox catalysis with copper complexes, sulfoximidoyl chlorides add to terminal aryl alkynes to give the corresponding (E)-β-chlorovinyl sulfoximines with exclusive regio- and stereoselectivities in high yields. Two representative products have been characterized by X-ray crystal structure analysis. Radicals appear to be decisive intermediates. As demonstrated by two subsequent
Divergent Hydroxysulfenylation and Chlorosulfonylation of Styrenes with Sulfinyl Chlorides Steered by Controlled Disproportionation of Sulfoxide‐Onium Ions
作者:Qingjin Liang、Tiezheng Jia
DOI:10.1002/adsc.202300320
日期:2023.6.13
Herein, sulfinylchlorides and styrenes have been exploited to afford either β-hydroxy-phenylethyl sulfides catalyzed by homogenous ZnCl2, or β-chloro-phenylethyl sulfones mediated by heterogeneous CuO nanoparticles (NPs). The key to achieve such a divergent synthetic strategy is the controlled disproportionation process of sulfoxide-onium ions, induced by different metal complexes. Owing to the mild
paper introduces a green and efficient method for synthesizing thiosulfonates in the aqueous phase. The approach has several benefits: it eliminates the need for catalysts and redox reagents and requires only a brief reaction time. These features give it significant economic value. Additionally, it enables the straightforward synthesis of 3-sulfenylindoles under the same conditions.