Oxidative cleavage of α-sulfonyl ketones to carboxylic acids with Ce(NH4)2(NO3)6
摘要:
Tandem oxidative cleavage of alpha-sulfonyl arylketones 2 with the combination of Ce(NH4)(2)(NO3)(6) and O-2 in MeCN afforded carboxylic acids 3 in moderate to good yields. The plausible reaction mechanism has been discussed. (C) 2014 Elsevier Ltd. All rights reserved.
Selenosulfonation of acetylenes: preparation of novel .beta.-(phenylseleno)vinyl sulfones and their conversion to acetylenic and .beta.-functionalized sulfones
Efficient sulfonylation of ketones with sodium sulfinates for the synthesis of β-keto sulfones
作者:Siqi Deng、En Liang、Yinrong Wu、Xiaodong Tang
DOI:10.1016/j.tetlet.2018.09.049
日期:2018.10
The oxidative sulfonylation of ketones with sodium sulfinates as the sulfone source and DMSO as the oxidant is reported. A series of β-keto sulfones were obtained in good to excellent yields. The advantages of this efficient protocol include the low cost of DMSO and HBr, and a broad scope.
An efficient synthetic route towards the synthesis of β-keto sulfones has been developed from secondary benzyl alcohols using N-bromosuccinimide (NBS). The present protocol utilizes NBS as oxidant as well as brominating agent, readily accessible benzyl alcohols and sodium arenesulfinates as the sulfonylating reagent under mild conditions. The control experiments revealed that the reaction proceeds
The reactions of p-toluenesulfonylmethyl isocyanide (TosMIC) with α-bromocarbonyl compounds leading efficiently to α-sulfonated ketones, esters, and amides were reported, in which an explicit new role of TosMIC as the sulfonylating agent was uncovered for the first time. Mechanistic study by control experiments and DFT calculations suggested that the reaction is initiated by Cu(OTf)2-catalyzed hydration
的反应p -toluenesulfonylmethyl胩(TOSMIC)用α-溴代化合物有效地导致α-磺化酮,酯和酰胺的报道,其中TOSMIC作为磺酰化剂的显式的新角色被揭露首次。通过对照实验和DFT计算进行的机理研究表明,该反应是由Cu(OTf)2催化的TosMIC水合引发的,形成了甲酰胺中间体,该中间体在Cs 2 CO 3添加剂的介导下易于进行C-S键裂解。
A Naphthalimide-Based ND-O-EAc Photocatalyst for Sulfonation of Alkenes to Access β-Ketosulfones Under Visible Light
作者:Xiaoting Yang、Jianjing Yang、Kelu Yan、Hongyun Qin、Wenjie Dong、Jiangwei Wen、Hua Wang
DOI:10.1002/ejoc.202000423
日期:2020.6.23
The development of facile, efficient, cost-effective, and visible light-driven photocatalysts for organic synthetic chemistry has received increasing attention. This protocol has initially synthesized a naphthalimide-basedND-O-EAcvisiblelightphotocatalyst for the sulfonation of alkenes to produce ketosulfones. Compared with the current photosynthetic strategies, the newly developed catalytic system