Metal-free oxidative coupling of alkyl chlorides with thiols: An efficient access to sulfoxides
作者:Qian Liu、Xiaoqian Zhao、Feng Xu、Gaoqiang Li
DOI:10.1016/j.tetlet.2019.151492
日期:2020.2
An efficient and step-economical access to sulfoxides from thiols and alkyl halides in the presence of I2O5 and DBU via direct oxidative couplings is described here. It is the first case that combined Williamson sulfide synthesis and subsequent sulfide oxidation into one step manipulation for sulfoxides preparation. This protocol features wide substrate scope, mild and metal-free conditons, the use
本文描述了在I 2 O 5和DBU存在下,通过直接氧化偶合从硫醇和烷基卤化物高效,经济地获取亚砜的方法。这是第一种将威廉姆森硫化物合成和随后的硫化物氧化结合起来一步一步进行亚砜制备的情况。该协议具有广泛的底物范围,温和无金属的条件,使用天然丰富的起始原料以及避免过度氧化的特点。
Nondirected Copper-Catalyzed Sulfoxidations of Benzylic C–H Bonds
作者:Hao Yu、Zhen Li、Carsten Bolm
DOI:10.1021/acs.orglett.8b00615
日期:2018.4.6
A copper-catalyzed sulfoxidation of benzylic C–H bonds by nondirected oxidative C(sp3)-H activation was developed. The process proceeds via sulfenate anions, which are generated by base-triggered elimination of β-sulfinyl esters and benzyl radicals. The functional group tolerance is high, and the product yields are good.
A metal-free method for formal β-arylation/heteroarylation of ketones through efficient cyclopropanol ring-opening cross-couplings with aryl sulfoxides at room temperature has been developed. This protocol shows a broad substrate scope and promising scalability. In addition, the utility of the β-arylated ketones is further demonstrated through a variety of postcoupling transformations and synthetic
A metal-free α-C–H functionalization of cyclic 1,2-diketones with aryl sulfoxides has been developed. This regioselective arylation involves nucleophilic substitution at the activated sulfoxide with a diosphenol, followed by [3,3]-sigmatropic rearrangement. This protocol can also be applied to the synthesis of polysubstituted cyclic 1,2-diketones with predictable structures by iterative arylations
Diaryl Sulfoxides from Aryl Benzyl Sulfoxides: A Single Palladium-Catalyzed Triple Relay Process
作者:Tiezheng Jia、Ana Bellomo、Sonia Montel、Mengnan Zhang、Kawtar EL Baina、Bing Zheng、Patrick J. Walsh
DOI:10.1002/anie.201307172
日期:2014.1.3
additional palladium‐catalyzed process. It is noteworthy that palladium‐catalyzed benzylative CS bond cleavage of sulfoxides is unprecedented. A wide range of arylbenzylsulfoxides, as well as alkyl benzylsulfoxides with various (hetero)aryl bromides were employed in the triplerelayprocess in good to excellent yields (85–99 %). Moreover, aryl methyl sulfoxides, dibenzyl sulfoxides, and dimethylsulfoxide