Oxysulfonylation of alkynes
WebNov 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. 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 …
Oxysulfonylation of alkynes
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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. WebFeb 4, 2024 · A highly enantioselective synthesis of β-hydroxysulfones from inexpensive and readily available alkynes via a consecutive one-pot reaction in MeOH/H2O under mild …
WebJul 30, 2024 · Herein, we report a novel heterogeneous photocatalyst for radical-mediated oxidative oxysulfonylation of alkynes to β-keto sulfones under environmentally benign … WebNov 25, 2024 · As a yolk-shell-structured bifunctional magnet catalyst, the FeCl 3 species enables an efficient aerobic oxysulfonylation between aryl-substituted terminal alkynes and sodium sulfinates to the β-keto sulfones intermediates, and the ruthenium/diamine species sequentially reduces the in-situ generated intermediate to the chiral β ...
WebJul 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 WebA highly efficient visible light-induced regioselective and stereoselective oxysulfonylation of alkynes with arylsulfonate phenol esters has been developed.
WebWe 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.
WebJan 1, 2024 · In the last decade, as one of the promising synthesis strategies, the direct oxysulfonylation of alkenes or alkynes has attracted considerable attention. A variety of … timesplitters 1 xboxWebMay 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... timesplitters 2 artWebOxy-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 parents anonymous is a self-help organizationWebSep 14, 2024 · Abstract We report here in an efficient electrochemical oxidative selenosulfonylation of alkynes and oxysulfonylation of alkenes without use of metal … parents answering modulesWebJan 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. parents anonymous phone numberWebJan 26, 2016 · Abstract A novel method to synthesise β-keto sulfones is demonstrated by Brønsted acid promoted oxysulfonylation of alkenes with sulfonyl hydrazides under … timesplitters 2 beta weaponsWebNov 8, 2024 · The challenge for the direct oxysulfonylation of alkynes lies in how to generate the oxidized vinyl radical and trap the corresponding oxidized electrophilic cation by H-atom. The sequential single electron transfer (SET) and proton transfer (PT) to sulfonyl radical intermediate could be an ideal route to achieve this goal. parents anniversary gift idea