61820-94-8

A copper-catalyzed aerobic oxidative cross-coupling reactions for the synthesis of β-ketosulfones via formation of a C[sbnd]S bond has been demonstrated. Promoted by the crucial copper catalyst, perfect selectivity and good to excellent yields could be achieved. This method, including inexpensive copper catalyst, wide functional group tolerance, and open air conditions, make it very attractive and practical. More importantly, it also provides a versatile tool for the construction of β-ketosulfones from basic starting materials under mild conditions.

The invention discloses a method for synthesizing a beta-ketosulfone derivative under a mild condition, which comprises the following steps: dissolving aryl olefin and sodium sulfinate in a solvent in a reaction container, adding an acidic additive, sealing the reaction container under the conditions that air exists in the reaction container and no transition metal exists, and purifying after reaction to obtain the beta-ketosulfone derivative. The free radical addition oxidation reaction of olefin and sulfinic acid can be realized under the mild condition without transition metal, the reaction raw materials are cheap and easy to obtain, no organic metal reagent or transition metal is needed, air is used as an oxidizing agent, no dangerous peroxide or persulfide is needed, and the method is compatible with air. The method has the advantages of simple operation and the like, and overcomes the defects of transition metal participation, large catalyst consumption, expensive reagents, high method cost, more reaction steps, more by-products and the like in the prior art.

A dioxygen-triggered oxosulfonylation/sulfonylation of unactivated olefins to achieve β-keto sulfones/sulfones has been developed. Interestingly, pluralistic mechanisms were found when different types of compounds were applied as substrates, and different products were achieved. The reaction is carried out with a high atomic efficiency in the absence of a metal and a catalyst at room temperature under an air atmosphere. Importantly, as a proof-of-concept, a bioactive molecule was synthesized on a gram-scale level using this method.

A readily accessible organic-inorganic hybrid catalyst is reported for the reductive fragmentation of α-halocarbonyl compounds. The robust hybrid catalyst is a self-stabilizing combination of ZnCl2 Lewis acid and acridine orange as the photoactive organic dye. Mechanistic specifics of this hybrid catalyst have been studied in detail using both photophysical and electrochemical experiments. A systematic study enabled the discovery of the appropriate Lewis acid for the effective LUMO stabilization of α-halocarbonyl compounds and thereby lowering of reduction potential within the range of a standard organic dye. This strategy resolves the issues like dehalogenative hydrogenation or homo-coupling of alkyl radicals by guiding the photoredox cycle through an oxidative quenching pathway. The cooperativity between the photoactive organic dye and the Lewis acid counterparts empowers functionalization with a wide range of coupling partners through efficient and controlled generation of alkyl radicals and serves as an appropriate alternative to the expensive late transition metal-based photocatalysts. To demonstrate the application potential of this cooperative catalytic system, four different synthetic transformations of α-carbonyl bromides were explored with broad substrate scopes.

A simple oxidative cross-coupling reaction between vinyl azides and sodium sulfinates was developed. This reaction uses commercial arylsulfinates that are more efficient, cheaper, and more stable as sulfonylation reagents, for efficiently, cheaply, and environmentally friendly synthesis of β-keto sulfones. And the reaction has the advantages of simple operation, high efficiency, good yield, and also has a wide range of functional group tolerance.

Here we report a novel and practical approach for preparing (E)-β-(thiocyanato)vinyl sulfones through the 1,2-thiocyanatosulfonation of terminal alkynes with NH4SCN and sulfonyl hydrazides. Advantages of this reaction include mild conditions, the absence of metal, readily available reagents, a broad substrate scope, good functional group compatibility, and excellent stereoselectivity. The radical species-induced pathway is also demonstrated by mechanistic studies.

Alkoxy radical-mediated carbon-carbon bond cleavages have emerged as a powerful strategy to complement traditional ionic-type transformations. However, carbon-carbon cleavage reaction triggered by alkoxy radical intermediate derived from the combination of alkyl radical and dioxygen, is scarce and underdeveloped. Herein, we report alkoxy radical, which was generated from alkyl radical and dioxygen, mediated selective cleavage of unstrained carbon-carbon bond for the oxysulfonylation of 1,1-disubstituted alkenes, providing facile access to a variety of valuable β-keto sulfones. Mechanistic experiments indicated alkoxy radical intermediate that underwent subsequent regioselective β-scission might be involved in the reaction and preliminary computational studies were conducted to provide a detailed explanation on the regioselectivity of the C—C bond cleavage. Notably, the strategy was successfully applied for constructing uneasily obtained architecturally intriguing molecules.

Charge separation plays a crucial role in regulating photochemical properties and therefore warrants consideration in designing photocatalysts. Metal–organic frameworks (MOFs) are emerging as promising candidates for heterogeneous photocatalysis due to their structural designability and tunability of photon absorption. Herein, we report the design of a pyrazole–benzothiadiazole–pyrazole organic molecule bearing a donor–acceptor–donor conjugated π-system for fast charge separation. Further attempts to integrate such a photosensitizer into MOFs afford a more effective heterogeneous photocatalyst (JNU-204). Under visible-light irradiation, three aerobic oxidation reactions involving different oxygenation pathways were achieved on JNU-204. Recycling experiments were conducted to demonstrate the stability and reusability of JNU-204 as a robust heterogeneous photocatalyst. Furthermore, we illustrate its applications in the facile synthesis of pyrrolo[2,1-a]isoquinoline-containing heterocycles, core skeletons of a family of marine natural products. JNU-204 is an exemplary MOF platform with good photon absorption, suitable band gap, fast charge separation, and extraordinary chemical stability for proceeding with aerobic oxidation reactions under visible-light irradiation.

A practical and environment-friendly methodology for the construction of β-keto sulfones through visible-light induced direct oxysulfonylation of alkenes with sulfonic acids at ambient temperature under open-air conditions was developed. Most importantly, the reaction proceeded smoothly without the addition of any photocatalyst or strong oxidant, ultimately minimizing the production of chemical waste.

Visible light promoted sulfonylation and sulfonylcarbonylation reactions of readily available alkenes with TosMIC for the synthesis of valuable vinyl sulfones and β-keto sulfones were described. A reasonable radical involved mechanism is proposed.

We reported an efficient and environmentally benign electrochemical synthesis of phenanthridines by oxidative coupling of vinyl azides with sodium azide or benzenesulfonyl hydrazides, for the first time. The reaction conditions are mild, and no additional metal-catalyst or exogenous oxidants are needed. The protocol has broad substrate scope and high functional group tolerance. Furthermore, this green electrochemical procedure can be readily extended to the synthesis of β-ketosulfones. Gram scale reactions further demonstrate the practicability.

Background: Peptic ulcer and urolithiasis are largely due to infection caused by urease-producing bacteria. Therefore, the discovery of urease inhibitors is an important area of medicinal chemistry research. Objective: The main aim of the work was to identify novel urease inhibitors with no cytotoxicity. Method: During the current study, a series of β-ketosulfones 1-26 was synthesized in two steps and evaluated for their in vitro urease inhibition potential. Results: Out of twenty-six compounds, seventeen have shown good to significant urease inhibitory activity with IC50 values ranging between 49.93-351.46 μM, in comparison to standard thiourea (IC50 = 21 ± 0.11 μM). Moreover, all compounds found to be non-cytotoxic against normal 3T3 cell line. Conclusion: This study has identified β-ketosulfones as novel and non-cytotoxic urease inhibitors.

A novel, facile and efficient strategy for the one-pot synthesis of β-ketosulfones from readily available sulfonyl chloride, hydrazine hydrate and vinyl azides is described. The reaction proceeded very smoothly affording diverse β-ketosulfones in moderate to good yields. This new procedure has the advantages of environmental benign, easy and simple operation, low cost and wide tolerance of functional groups, which provides a highly fascinating protocol to access β-ketosulfones.

A new system for synthesis of a wide range of β-keto sulfones using sulfated tungstate as a heterogeneous catalyst and oxygen as an environmentally benign oxidant with aryl hydrazides and styrenes as reacting counterparts has been developed. The preliminary experimental results support the involvement of free radical species. Thus, aryl sulfonyl free radicals, generated by oxidation of aryl sulfonyl hydrazides, subsequently undergo a tandem addition to styrenes to form intermediate benzyl free radicals, and oxygen capture and oxidation to furnish β-keto sulfones. The method is mild and efficient with easy workup procedures. The catalyst is recyclable. This journal is

The invention discloses a preparation method of a beta-carbonyl sulfone compound, and belongs to the technical field of organic synthesis. The preparation method of the beta-carbonyl sulfone compoundis provided for solving the problems that in the prior art, operation is complex, the substrate range is narrow, and the functional group tolerance is poor. The preparation method comprises the stepsof taking a compound shown in formula I and a compound shown in formula II as raw materials, taking copper salt as a catalyst, carrying out reaction in an organic solvent, and after the reaction is completed, carrying out aftertreatment to obtain the beta-carbonyl sulfone compound. The preparation method is simple and convenient to operate, mild in reaction condition, wide in substrate range and good in functional group tolerance, the yield reaches up to 93%, and the synthesis cost is remarkably reduced.

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-based ND-O-EAc visible light photocatalyst for the sulfonation of alkenes to produce β-ketosulfones. Compared with the current photosynthetic strategies, the newly developed catalytic system has some merits, namely high efficiency, gram-scale preparation of low-cost photocatalyst, no metal contamination, wide substrate scope, and green terminal oxidant of air. Moreover, the prepared photocatalyst of ND-O-EAc is feasible for the sulfonation reactions of androstenones. Importantly, such a photocatalysis strategy can easily realize the scale-up synthesis for β-ketosulfone drugs under the mild conditions up to 90 % yield.

Biomimetic photocatalysis as an important organic transformation strategy has received increasing attention, with the performances of biomimetic catalysts largely depending on their design. This protocol has been initially used to fabricate a biomimetic photocatalyst of single-atom iron site through coupling carbon nitride with hemin (CNH) for the visible light-promoted sulfonation of alkenes to produce β-ketosulfones with up to 94% yield. The experimental results show that the role of CN in CNH is concentrated on enhancing the separation ability of photogenerated electron pairs and holes to improve the photocatalytic activity and stability. Moreover, the as-prepared photocatalyst of single atom iron can be irradiated under near-infrared light with a satisfactory yield, and is also feasible for the sulfonation reactions of androstenones. Importantly, this biomimetic catalysis-based synthesis system has some merits, namely high catalysis efficiency, favorable recyclability, high turnover number, and excellent functional group tolerance, making it promising for extensive applications in organic transformations for the synthesis of β-ketosulfones to access various bioactive drugs.

Abstract: Cu 2 +-doped zeolitic imidazolate framework-8 (ZIF-8)-catalyzed one-pot procedure to synthesize β -keto and vinyl sulfones by the direct oxysulfonylation and hydrosulfonylation of alkynes via radical reaction under mild conditions has been described. The advantages of this protocol included broad substrate scope and excellent β -keto and E-stereoselectivity. The Cu/ZIF-8 catalyst not only exhibited excellent performance but also had a great stability in the reaction, successfully allowing its reuse up to five cycles. This efficient Cu/ZIF-8 heterogeneous catalyst is explored for the first time to generate β -keto and vinyl sulfones. Graphical Abstract:: Cu 2 +-doped zeolitic imidazolate framework-8 (ZIF-8)-catalyzed one-pot procedure to synthesize β -keto and vinyl sulfones by the direct oxysulfonylation and hydrosulfonylation of alkynes via radical reaction under mild conditions is described. The advantages of this protocol included broad substrate scope and excellent β -keto and E-stereoselectivity. This efficient Cu/ZIF-8 heterogeneous catalyst is explored for the first time for C-S bond formation. [Figure not available: see fulltext.].

An efficient and practical route to β-keto sulfones has been developed through heterogeneous oxidative coupling of oxime acetates with sodium sulfinates by using an MCM-41-supported Schiff base-pyridine bidentate copper (II) complex [MCM-41-Sb,Py-Cu (OAc)2] as the catalyst and oxime acetates as an internal oxidant, followed by hydrolysis. The reaction generates a variety of β-keto sulfones in good to excellent yields. This new heterogeneous copper (II) catalyst can be easily prepared via a simple procedure from readily available and inexpensive reagents and exhibits the same catalytic activity as Cu (OAc)2. MCM-41-Sb,Py-Cu (OAc)2 is also easy to recover and is recyclable up to eight times with almost consistent activity.

The invention discloses a method for synthesizing a high-added-value alpha-sulfone ketone compound from an alpha, alpha-dibromo ketone compound by a one-pot process. The method has the advantages thatan alpha-sulfone ketone derivative is synthesized from alpha, alpha-dibromo ketone, which is simple and easy to obtain, by the one-pot process without separation of an alpha-bromo ketone intermediate, so that a separation process for an intermediate product is omitted, the steps are reduced, and requirements for environment protection are met; the steps of the method are simple and easy to operate, no transition metal reagents are required, and economical sulfonate with less pollution is directly used as a promoter and a sulfonating agent for reducing debromination of the alpha, alpha-dibromoketone, so that the cost is reduced, and economic benefits of reactions are increased; a system for preparing the alpha-sulfone ketone derivative by the one-pot process is developed to provide a novel synthesis method for preparation of the alpha-sulfone ketone compound, and the method has good industrialization prospect and potential application value.

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 via oxidation of alcohol to ketone, α-bromination of ketone and nucleophilic substitution by sodium arenesulfinate. Furthermore, the efficiency of the methodology was tested with a gram scale reaction and also shown the synthetic utility.

A practical method has been developed for the conversion of alkenes to β-keto/hydroxyl sulfones by their reaction with sulfonyl hydrazides under metal-free conditions. This reaction proceeds through the oxidative addition of alkenes by sulfonyl radicals that are generated by visible-light induced oxidation of sulfonyl hydrazides. Notaly the reaction uses O2 as the terminal oxidant, instead of metal catalysts or oxidants like TBHP, leading to H2O and N2 as the clean by-products. The key features of this reaction include readily available reagents, mild reaction conditions and broad substrate scope.

The invention discloses beta-keto sulfone derivatives as well as a preparation method and application thereof. The preparation method includes the following step: performing a reaction by using olefinazide and sulfonyl hydrazide as starting material, CuSO.5HO as a catalyst and water as a reaction solvent at 90 DEG C for 2-4 h. According to the method provided by the invention, the catalystCuSO.5HO is used in the reaction system, so that the reaction is effectively promoted, a self-coupling reaction of the sulfonyl hydrazide is inhibited, and the yield of the reaction is improved;meanwhile, the reaction reagents and catalyst used in the method are stable, cheap and easy to obtain, mass production is facilitated, and a novel effective way is provided for construction of the structures; the reaction solvent is water, and has the advantages of green economy and environmental protection; and in addition, results of activity experiments show that the product can inhibit 11 beta-hydroxysteroid dehydrogenase to a certain extent, so that the preparation method and the product have important application significance in the field of medicine.

A novel TBAI-catalyzed radical sulfonylation of readily available N,N-dimethylenaminones with sulfonylhydrazides to afford functionalized β-keto-sulfones has been developed. Various functional groups were tolerated well under the present oxidative conditions and the corresponding β-keto-sulfone compounds were obtained in moderate to good yields. Importantly, this transformation offered the first protocol for Csp3–S bond formation by oxidative Csp2–Csp2 bond cleavage in one step.

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.

The synthesis and characterization of two new sets of arylsulfonehydrazone benzenesulfonamides (4a-4i with phenyl tail and 4j-4q with tolyl tail) are reported. The compounds were designed according to a dual-tails approach to modulate the interactions of the ligands portions at the outer rim of both hydrophobic and hydrophilic active site halves of human isoforms of carbonic anhydrase (CA, EC 4.2.1.1). The synthesized sulfonamides were evaluated in vitro for their inhibitory activity against the following human (h) isoforms, hCA I, II, IV and IX. With the latter being a validated anticancer drug target and a marker of tumor hypoxia, attractive results arose from the Compounds’ inhibitory screening in terms of potency and selectivity. Indeed, whereas the first subset of compounds 4a-4i exhibited great efficacy in inhibiting both the ubiquitous, off-target hCA II (KIs 9.5–172.0 nM) and hCA IX (KIs 7.5–131.5 nM), the second subset of tolyl-bearing derivatives 4j-4q were shown to possess a selective hCA IX inhibitory action over isoforms I, II and IV. The most selective compounds 4l and 4n were further screened for their in vitro cytotoxic activity against MCF-7 and MDA-MB-231 cancer cell lines under hypoxic conditions. The selective IX/II inhibitory trend of 4j-4q compared to those of compounds 4a-4i was unveiled by docking studies. Further exploration of these molecules could be useful for the development of novel antitumor agents with a selective CA inhibitory mechanism.

A metal-free protocol for the selective cleavage of unstrained C–C single bonds was developed. Under the catalysis of KI and in the presence of NaHCO3, the readily available α-chloro-β-hydroxy ketones underwent bond breaking and sulfonylation smoothly to afford β-ketosulfones with high efficiency and broad substrate scope. Mechanism investigations, both experimental and theoretical, showed that a retro-aldol cleavage/nucleophilic substitution sequence might be involved.

We report herein the AgNO2/Pd(PPh3)4-promoted regiocontrolled o-nitration of α-sulfonylmethylstyrenes in MeNO2 with good yields. The o-nitration process provides a series of sulfonyl o-nitrostyrenes. Substituted α-sulfonylmethylstyrenes were synthesized from ZnI2-mediated sulfonylation of substituted α-methylstyrenes and sodium sulfinates (RSO2Na) in MeCN with good to excellent yields. The structures of the key products were confirmed by X-ray crystallography. A plausible mechanism has been proposed herein.

Novel oxazolidin-2-one-linked 1,2,3-triazole derivatives (4a-k) were synthesized by straightforward and versatile azide-enolate (3 + 2) cycloaddition. The series of compounds was screened for antifungal activity against four filamentous fungi as well as six yeast species of Candida spp. According to their efficiency and breadth of scope, they can be ordered as 4k > 4d > 4h > 4a, especially in relation to the activity displayed against Candida glabrata ATCC-34138, Trichosporon cutaneum ATCC-28592 and Mucor hiemalis ATCC-8690, i.e. compounds 4d, 4h and 4k showed excellent activity against C. glabrata (MIC 0.12, 0.25 and 0.12 μg mL-1, respectively), better than that of itraconazole (MIC 1 μg ml-1). The activity of compound 4d (MIC = 2 μg mL-1) was higher than that observed for the standard antifungal drug (MIC = 8 μg mL-1) against Trichosporon cutaneum, while compound 4k displayed an excellent antimycotic activity against Mucor hiemalis (MIC = 2 μg mL-1vs. 4 μg mL-1 for itraconazole). In addition, we describe herein a novel mild and eco-friendly synthetic protocol for obtaining β-ketosulfones (adducts to afford compounds 4a-k) from α-brominated carbonyls in an aqueous nanomicellar medium at room temperature.

We developed a photoinduced radical fragmentation and rearrangement of vinyl tosylates that enables efficient formation of β-ketosulfones. This process is based on the photoinitiated homolysis of vinyl tosylate to release a sulfinyl radical from the tosyl group and the subsequent addition of a sulfinyl radical to another vinyl tosylate to form the desired β-ketosulfones. This simple protocol features a broad scope with both aromatic and aliphatic substrates, convenient reagents and operating systems.

The invention provides a method for efficiently synthesizing beta-ketone sulfonyl compounds through visible light induction. The method specifically comprises steps as follows: in the presence of an organic solvent and at the room temperature, enol sulfonate compounds are taken as a raw material and react for 1-12 h through induction of visible light under the catalysis action of an organic compound serving as a photocatalyst, and the beta-ketone sulfonyl compounds are prepared. Compared with an existing method, the method has a wide applicable substrate range, a substrate is convenient and easy to obtain, reaction conditions are mild, operation is simple and convenient, the reaction efficiency is high, and the method has huge value in industrial application.

A combination of o-iodoxybenzoic acid (IBX) and a catalytic amount of iodine is found to promote a facile one-pot deacylative sulfonylation reaction of 1,3-dicarbonyl compounds with sodium sulfinates to yield β-carbonyl sulfones. The present method provides the target products bearing a wide variety of functional groups in one step and in good yields.

Copper(i) halides were used as mediators in the synthesis of β-hydroxysulfones via the oxysulfonylation of styrenes using sulfonylhydrazides. The feature of the developed process lies in the combination of a copper(i) salt with oxygen - the stoichiometric oxidant. Copper(ii) species are responsible for the oxidation of sulfonylhydrazides, they are generated in small amounts in the O2/Cu(i)/Cu(ii) redox system, which is formed during the reaction. The combination of these three components enables one to obtain in the case of α-methylstyrenes only β-hydroxysulfones and in the case of α-unsubstituted styrenes, β-hydroxysulfones as the main products and β-ketosulfones as the by-products. With good yields β-hydroxysulfones were prepared by reduction of the reaction mixture containing both products β-hydroxysulfones and β-ketosulfones with NaBH4. An electrochemical study revealed that the Cu(i)/Cu(II) pair can serve as an effective mediator of β-hydroxysulfones formation via redox processes.

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 reaction conditions.

A novel and efficient protocol for the synthesis of β-keto-sulfone derivatives via TBAI/TBHP mediated oxidative cross-coupling of vinyl acetates with sulfonylhydrazides has been developed.

Nickel-catalyzed hydroxysulfonylation of alkenes was achieved using sodium sulfinates under air atmosphere. The procedure enabled the selective synthesis of β-hydroxysulfones in good yields and suppressed the formation of β-ketosulfones. On the contrary, sulfonylation of alkynes with sodium sulfonates afforded only β-ketosulfones.

A facile synthetic route towards pharmaceutically interesting β-keto-sulfone derivatives by tetrabutylammonium iodide (TBAI)/tert-butyl hydroperoxide (TBHP) mediated oxidative coupling of readily prepared enamides with economical sulfonylhydrazides is described. The corresponding β-keto-sulfone compounds were obtained in moderate to good yields. The present method is metal-free and base-free and shows tolerance to a variety of functional groups. This journal is

An unprecedented single electron redox process in copper catalysis is confirmed using operando X-ray absorption and EPR spectroscopies. The oxidation state of the copper species in the interaction between Cu(ii) and a sulfinic acid at room temperature, and the accurate characterization of the formed Cu(i) are clearly shown using operando X-ray absorption and EPR evidence. Further investigation of anion effects on Cu(ii) discloses that bromine ions can dramatically increase the rate of the redox process. Moreover, it is proven that the sulfinic acids are converted into sulfonyl radicals, which can be trapped by 2-arylacrylic acids and various valuable β-keto sulfones are synthesized with good to excellent yields under mild conditions.

Sulfone derivatives are important synthetic intermediates. However, the general method for their preparation is through traditional coupling reaction: the alkylation of sodium sulfinates with phenacyl halides. Based on our previous work on sodium sulfinates and oxime acetates, we herein report a novel method for sulfone derivatives by oxidative coupling with sodium sulfinates and oxime acetates using copper as catalyst. The sulfonylvinylamine products could be formed in excellent yields. Upon hydrolysis by silica gel in CH 2Cl2, β-ketosulfones could also be efficiently constructed. Various sulfonylvinylamines and β-ketosulfones were obtained in good to excellent yields under the optimized reaction conditions. Mechanistic studies indicated that this transformation involved copper-catalyzed N-O bond cleavage, activation of a vinyl sp2 C-H bond, and C-S bond formation. The oxime acetates act as both a substrate and an oxidant, thus the reaction needs no additional oxidants or additives. Copper brings us together: The title reaction involves copper-catalyzed N-O bond cleavage, activation of a vinyl sp2 C-H bond and C-S bond formation; it uses simple oxime acetates and sodium sulfinates to synthesize sulfonylvinylamine products without the need for additional oxidants or additives. Upon hydrolysis, useful β-ketosulfones are obtained.

A novel iron-catalyzed direct difunctionalization of alkenes with sulfinic acids and dioxygen for the synthesis of β-ketosulfones has been developed under mild conditions. The present protocol, which utilizes an inexpensive iron salt as the catalyst, readily available benzenesulfinic acids as the sulfonylating reagents, and dioxygen as the oxidant and oxygen source, provides a cost-effective and environmentally benign approach to access various β-ketosulfones.

A novel imidazolium-based ionic liquid-supported hypervalent iodine reagent has been synthesized and employed for a 'catch and release' strategy with substituted acetophenones to generate various α-substituted acetophenones in good to excellent yields. The use of an ionic liquid-supported hypervalent iodine reagent avoids chromatographic separation for the purification of α-substituted acetophenones and thus makes the method greener.

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Substituted 2-arylbenzimidazoles (4) were easily synthesized in good yields starting from the condensation reaction of 1,2-diaminobenzenes (1) with β-ketosulfones (5) in the presence of boiling HOAc.

A mild, practical method to prepare α-sulfonyl and α-trifluoromethyl ketones from readily available enol acetates and sulfonyl chlorides has been developed using visible-light photoredox catalysis. The method could be used with a wide range of enol acetates and sulfonyl chlorides, and gave the desired products in satisfactory to excellent yields. A practical method to prepare α-sulfonyl and α-trifluoromethyl ketones from enol acetates and sulfonyl chlorides using visible-light photoredox catalysis is presented. Copyright

A direct synthesis of -keto sulfones from alkenes is described. A combination of o-iodoxybenzoic acid/iodine (IBX/I was found to mediate the reactions of alkenes with arenesulfinates to yield -keto sulfones in good yields via a one-pot reaction. Georg Thieme Verlag Stuttgart · New York.

A novel task-specific ionic liquid, 1-butyl-3-methylimidazolium p-toluenesulfinate, [bmim][p-TolSO2] has been synthesized and used as a nucleophile for the reaction with alkyl bromides and phenacyl bromides to prepare sulfones and β-ketosulfones in excellent yields (80-93%) in [bmim][BF4] ionic liquid. The isolated yields of sulfones and β-ketosulfones were higher in [bmim][BF4] than other organic solvents at room temperature.

An easy solvent-free method is described for the conversion of ketones into β-keto sulfones in high yields that involves the in situ generation of α-tosyloxyketones, followed by nucleophilic substitution with sodium arene sulfinate in the presence of tetra-butylammonium bromide at room temperature. The salient features of this one-pot protocol are short reaction times, cleaner reaction profiles, and simple work-up that precludes the use of toxic solvents.

An efficient and convenient synthesis of β-ketosulfones is described. Reaction of an α-haloketone with sodium alkyl/aryl sulphinate yields the corresponding β-ketosulfone promoted by polyethylene glycol (PEG-400) as an efficient reaction medium.

Synthesis of 2-amino-4-aryl-5-arylsulfonyl thiazoles 2a-i have been successfully carried out in one pot by condensing α-aryl sulfonyl-4-substituted acetophenones with phenyl trimethyl ammonium tribromide (PTT) and thiourea. The required α-aryl sulfonyl-4-substituted acetophenones have also been prepared by modified one pot method.

A short and versatile synthesis of substituted quinolines is provided. Alkylation of sodium tolylsulfinate with bromomethyl- or chloromethyl ketones generates β-keto sulfones. Knoevenagel condensation of the β-keto sulfones with an aldehyde provides α-tolylsulfonyl-α,β-unsaturated ketones. Michael addition of the dianion of N-Boc-anilines in the presence of CuCN and LiCl with the unsaturated ketone generates a 1,4-adduct, which after deprotection of the Boc group and thermal elimination of the tolyl sulfone provides the quinoline.