Abstract A catalyst‐free approach for the generation of sulfonyl radicals from aryldiazonium tetrafluoroborates in presence DABCO⋅(SO 2 ) is realized. The combination tetrafluoroborates, , and aryl propiolates affords 3‐sulfonated coumarins good to excellent yields. This tandem reaction process involves radical addition, spirocyclization, 1,2‐migration esters. Additionally, situ diazotization a number anilines allows directional synthesis desired one‐pot, two‐step process.

Abstract The coupling of aryldiazonium tetrafluoroborates, DABCO⋅(SO 2 ) , and hydrazines under metal‐free conditions leads to the formation aryl N ‐aminosulfonamides. reaction proceeds smoothly at room temperature shows broad functional‐group tolerance. A radical process is proposed for this transformation.

A visible-light-initiated α-perfluoroalkyl-β-heteroarylation of various alkenes with perfluoroalkyl iodides and quinoxalin-2(1H)-ones is presented. This three-component radical cascade reaction allows an efficient synthesis a range containing quinoxalin-2(1H)-one derivatives in moderate to excellent yields under mild conditions. Reactions proceed via acidic aminyl radicals that are readily deprotonated give the corresponding anions able sustain chain as single electron transfer reducing...

Abstract An enantioselective three‐component radical reaction of quinolines or pyridines with enamides and α‐bromo carbonyl compounds by dual photoredox chiral Brønsted acid catalysis is presented. A range valuable γ‐amino‐acid derivatives are accessible in high chemo‐, regio‐, enantioselectivity from simple, readily available starting materials under mild conditions. Using the same strategy, asymmetric synthesis 1,2‐diamine also reported.

A copper(<sc>i</sc>)-catalyzed three-component reaction of triethoxysilanes, DABCO·(SO₂)₂, and alkyl halides is reported. This transformation provides a facile route to sulfones under ligand-free conditions catalyzed by copper(<sc>i</sc>) oxide. The insertion sulfur dioxide efficient, both triethoxyarylsilanes triethoxyalkylsilanes are practicable during the coupling process.

A catalyst-free aminosulfonylation through insertion of sulfur dioxide with aryl/alkyl halides enabled by photoenergy is presented. Under ultraviolet irradiation, a three-component reaction halides, dioxide, and hydrazines proceeds under mild conditions without any metals or photo-redox catalysts.

A photoredox-catalyzed sulfonylation of alkyl iodides, sulfur dioxide, and electron-deficient alkenes under mild conditions is achieved. Various functional groups including nitro, halo, acetyl, sufonyl, pyridinyl are all tolerated the photoredox conditions.

A copper-catalyzed three-component reaction of 2-ethynylaniline, sulfonyl azide, and nitroolefin is reported. This generates functionalized indoles in good yields proceeds smoothly under mild conditions. Some hits as an HCT-116 inhibitor are found from the preliminary biological screening.

A cobalt-promoted coupling reaction of triethoxysilanes, sulfur dioxide, and electrophiles is developed. Different electrophilic partners including alkyl bromides, iodonium salts, electron-poor (hetero)aryl chlorides work well under the standard conditions.

Facile assembly of 3-((arylsulfonyl)methyl)indolin-2-ones <italic>via</italic> insertion sulfur dioxide starting from anilines, <italic>N</italic>-arylacrylamides and DABCO·(SO₂)₂ is realized.

A facile route to aryl N-aminosulfonamides under mild conditions is provided. The reaction of aromatic amines (including heteroaromatic amines), sulfur dioxide, and hydrazines proceeds efficiently with good functional group tolerance. in situ generated diazonium ion involved the aminosulfonylation process.

The scaffold of benzo[<italic>b</italic>]thiophene 1,1-dioxides can be easily constructed through a copper(<sc>i</sc>)-catalyzed insertion sulfur dioxide into (2-alkynylaryl)boronic acids. reaction proceeds <italic>via</italic> and subsequent intramolecular 5-<italic>endo</italic> cyclization.

A copper-catalyzed aminosulfonylation of aryldiazonium tetrafluoroborates, DABCO·(SO2)2, and N-chloroamines is described. This coupling reaction provides an efficient simple approach to a wide range sulfonamides in moderate good yields under mild conditions. Mechanistic investigation suggests that radical process transition-metal catalysis are merged this tandem reaction.

Abstract A photocatalytic reaction of N ‐(2‐vinylphenyl)amides, DABCO⋅(SO 2 ) and arenediazonium tetrafluoroborates for the synthesis 4‐((arylsulfonyl)methyl)‐4 H ‐benzo[ d ][1,3]oxazines under mild conditions is reported. This synthetic approach enabled by merging photoredox catalysis insertion sulfur dioxide via a radical process. The specific role in this transformation supported mechanistic investigations theoretical calculations. magnified image

A photoredox-catalyzed 1,2-amidoheteroarylation of unactivated alkenes with O-acyl hydroxylamine derivatives and heterocycles is presented. range heterocycles, including quinoxaline-2(1H)-ones, azauracils, chromones, quinolones, are capable for this process, allowing the direct synthesis valuable heteroarylethylamine derivatives. Structurally diverse reaction substrates, drug-based scaffolds, were successfully applied, demonstrating practicality method.

An unexpected silver triflate catalyzed reaction of 2-alkynylbenzaldehyde with 2-isocyanoacetate provides an efficient route for the generation isoquinolines. The proceeds smoothly in air under mild conditions high efficiency.

A three-component reaction of 2-(allyloxy)anilines, sulfur dioxide and hydrazines under mild conditions is developed, which gives rise to 1-(2,3-dihydrobenzofuran-3-yl)-methanesulfonohydrazides in good yields. This radical process involves an intramolecular 5-exo-cyclization insertion dioxide.

Abstract A three‐component reaction of aryldiazonium tetrafluoroborates, the 1,4‐diazabicyclo[2.2.2]octane⋅bis(sulfur dioxide) adduct [DABCO⋅(SO 2 ) ] and hydroxylamines under catalyst‐free additive‐free conditions has been developed, providing aryl O ‐aminosulfonates in good yields. Sulfonamides could also be obtained via a one‐pot process through DABCO⋅(SO amines presence N ‐hydroxybenzotriazole. mechanism involving insertion sulfur dioxide hydrogen atom transfer is proposed supported by...

A green approach for the generation of β-keto sulfones through a reaction aryldiazonium tetrafluoroborates and sulfur dioxide with silyl enol ether under catalyst- additive-free conditions has been realized. This proceeds efficiently at room temperature goes to completion in half an hour. During process, tetrafluoroborate is treated DABCO⋅(SO2 )2 (DABCO=1,4-diazabicyclo[2.2.2]octane) provide sulfonyl radical as key intermediate, which then initiates transformation. Oxidants or metal...

A direct C(sp3)-H sulfinylation reaction of alkanes with sulfinyl sulfones via decatungstate photocatalysis is reported. The generated in situ from sulfinates the presence an acylating reagent were able to trap alkyl radicals that produced photoinduced hydrogen atom transfer alkanes, leading a range sulfoxides. This radical process provides efficient and concise method for synthesis sulfoxides abundant under mild conditions. Using same strategy, aldehydes can also be transferred...

Rainwater is the primary water source with which terrestrial plastic pollutants interact. Not only could active substances in rainwater generate additional reactive oxygen species but also react photoaging intermediates of plastic. Precipitation and evaporation lead to repeated shifts between solid–liquid solid–gas interfaces during photoaging. To investigate impact these on photoaging, polyvinyl chloride, polypropylene, polystyrene, polyethylene microplastics were exposed UVA, UVB, or UVC...

Abstract The coupling of aryldiazonium tetrafluoroborates, DABCO⋅(SO 2 ) , and hydrazines under metal‐free conditions leads to the formation aryl N ‐aminosulfonamides. reaction proceeds smoothly at room temperature shows broad functional‐group tolerance. A radical process is proposed for this transformation.

Abstract A catalyst‐free approach for the generation of sulfonyl radicals from aryldiazonium tetrafluoroborates in presence DABCO⋅(SO 2 ) is realized. The combination tetrafluoroborates, , and aryl propiolates affords 3‐sulfonated coumarins good to excellent yields. This tandem reaction process involves radical addition, spirocyclization, 1,2‐migration esters. Additionally, situ diazotization a number anilines allows directional synthesis desired one‐pot, two‐step process.

A base-promoted cascade reaction of (E)-2-alkynylphenylchalcone with 2-isocyanoacetate provides a novel and efficient route for the synthesis tetrahydroindeno[2,1-b]pyrroles. The proceeds smoothly in air under mild conditions high efficiency.