Oxysulfonylation of alkynes
WebApr 12, 2024 · A variety of aryl and alkyl sulfinates were converted to the corresponding sulfones with good yields. In particular, the heterogeneous catalyst could be recovered easily after the synthesis and consecutively used at least five times with no appreciable decrease in the catalytic activity. WebJan 25, 2024 · A novel full atom-economic process for the transformation of alkynes into chiral alcohols by TfOH-catalyzed hydration coupled with Ru-catalyzed tandem asymmetric hydrogenation in TFE under simple conditions has been developed.
Oxysulfonylation of alkynes
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WebMay 23, 2013 · New channel! A novel and attractive dioxygen activation by sulfinic acids was explored that is capable of performing efficiently without the assistance of transition metals or radical initiators. Thi... WebThe combination of 4-substituted pent-4-en-1-ols, DABCO· (SO 2) 2, and aryldiazonium tetrafluoroborates under mild conditions in the presence of a photocatalyst provides sulfonated 2,2-disubstituted tetrahydrofurans in moderate to good yields.
WebJan 11, 2024 · The intermediates, β-keto sulfones, generated from an aerobic oxysulfonylation of terminal alkynes and sodium sulfinates catalyzed by an iron salt in MeOH/H 2 O (v : v = 3 : 1) at 50 °C, were subsequently reduced by a Ru-catalyzed asymmetric transfer hydrogenation with HCOONa as a hydrogen source. WebApr 15, 2024 · Recently, radical-based sulfonylations of alkynes with different sulfonyl precursors have emerged as efficient solutions for preparing β-keto sulfones because of their elegant atom economy and step economy (Handa et al. 2014; Lu et al. 2013; Mei et al. 2024; Ni et al. 2024; Pampana et al. 2024; Reddy and Kumari 2024 ).
WebJul 30, 2024 · The oxygen vacancy-rich semiconductor Nb 2 O 5 (labeled as OVs-N-Nb 2 O 5) could efficiently catalyze a wide range of alkynes, especially for those bearing electron-deficient substituents or internal alkynes, to their corresponding β-keto sulfones in good to high yields with good tolerance of diverse functional groups under visible-light … WebJul 9, 2024 · (A) Substrate scope for asymmetric oxysulfonylation of terminal alkenes. Reactions were conducted on 0.2 mmol scale, isolated yields were given, and er values were determined by HPLC analysis. (B) Transformation of the oxysulfonylation product. In the following study, we switched our attention to evaluate the scope of sulfonyl chlorides.
WebOct 7, 2014 · This simple oxysulfonylation protocol involves the FeCl3/K2S2O8 catalyzed formation of sulfonyl radicals from sulfinate salts. No full-text available Molecular iodine mediated oxidative coupling...
WebA highly efficient visible light-induced regioselective and stereoselective oxysulfonylation of alkynes with arylsulfonate phenol esters has been developed. ling ling chicken and vegetable potstickersWebOxy-sulfonylation of terminal alkynes via C–S coupling enabled by copper photoredox catalysis † V. Kishore Kumar Pampana, a Vaibhav Pramod Charpe,a Arunachalam Sagadevan, a Deb Kumar Das, a Chun-Cheng Lin, a Jih Ru Hwu a and Kuo Chu Hwang *a Author affiliations Abstract ling-ling chineseWebMay 4, 2016 · A variety of functionalized β-keto sulfones were smoothly prepared through oxysulfonylation of commercially available alkynes with sulfonylhydrazides under the synergistic interactions of visible light irradiation, Ru(bpy)3Cl2 photocatalyst, oxygen, KI, and NaOAc basic additive under very mild react … hot tub wrap aroundWebJan 2, 2024 · Among them, the oxidative difunctionalization of alkynes with various sulfonylating agents such as sulfinic acids, sulfinates, and sulfonylhydrazides have attracted the increasingly synthetic attention of chemists due to the diversity and commercial availability of alkynes [9]. ling ling chinese bath nyWebJul 26, 2016 · Visible light along with 1 mol% eosin Y catalyzed the direct oxysulfonylation of alkenes with sulfinic acids via a photoredox process which has been developed at room temperature under transition-metal-free conditions. The present reaction provides a highly efficient approach to diverse β-ketosulfones in mod ling ling chicken potstickers ingredientsWebWe report here in an efficient electrochemical oxidative selenosulfonylation of alkynes and oxysulfonylation of alkenes without use of metal catalysts. This method provides a practical access to a wide range of β-(seleno)vinyl sulfones and β-keto sulfones. These reactions can tolerate various functional groups and be easily scaled-up. hot tub yellow slimeWebNov 11, 2013 · The first copper-catalyzed oxysulfonylation reaction of alkenes with dioxygen and sulfonylhydrazides for the construction of β-ketosulfones has been developed under mild conditions without any ligand or additive. hot tub xfl