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Search for "catalytic" in Full Text gives 1619 result(s) in Beilstein Journal of Organic Chemistry. Showing first 200.

Synthesis of the 1,5-disubstituted tetrazole-methanesulfonylindole hybrid system via high-order multicomponent reaction

  • Cesia M. Aguilar-Morales,
  • América A. Frías-López,
  • Nadia V. Emilio-Velázquez,
  • Alejandro Islas-Jácome,
  • Angelica Judith Granados-López,
  • Jorge Gustavo Araujo-Huitrado,
  • Yamilé López-Hernández,
  • Hiram Hernández-López,
  • Luis Chacón-García,
  • Jesús Adrián López and
  • Carlos J. Cortés-García

Beilstein J. Org. Chem. 2024, 20, 3077–3084, doi:10.3762/bjoc.20.256

Graphical Abstract
  • of the 1,5-disubstituted tetrazole-alkyne intermediates was unnecessary; we previously reported this heterocyclic system [24][25][26]. The heteroannulation reaction was then investigated under the most common conditions, utilizing a catalytic system comprising PdCl2(PPh3)2, Et3N and CuI [23][28
  • to obtain the 1,5-disubstituted tetrazole-alkyne 19 is well-documented and hence, it is not herein described in detail [1][26][31]. Thus, based on Pal and co-workers’ proposal [32][33], the second process involves two catalytic cycles: 1) a Sonogashira coupling, and 2) a 5-endo-dig cyclization. The
  • first catalytic cycle begins with the coupling of 1,5-disubstituted tetrazole-alkyne 19 and methanesulfonyl-2-iodoaniline 17 forming the intermediate 23. Following a reductive elimination, the Sonogashira-like product 24 is produced, which then progresses into the second catalytic cycle. In this cycle
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Published 26 Nov 2024

Enantioselective regiospecific addition of propargyltrichlorosilane to aldehydes catalyzed by biisoquinoline N,N’-dioxide

  • Noble Brako,
  • Sreerag Moorkkannur Narayanan,
  • Amber Burns,
  • Layla Auter,
  • Valentino Cesiliano,
  • Rajeev Prabhakar and
  • Norito Takenaka

Beilstein J. Org. Chem. 2024, 20, 3069–3076, doi:10.3762/bjoc.20.255

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  • , University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146-0431, USA 10.3762/bjoc.20.255 Abstract Distilled propargyltrichlorosilane with >99% isomeric purity was prepared for the first time, and its asymmetric catalytic regiospecific addition reaction to aldehydes was developed through a
  • . Accordingly, the development of efficient access to optically active chiral α-allenic alcohols continues to be of significant interest in organic chemistry [11][12][13]. The asymmetric catalytic addition of allenylation reagents to aldehydes provides direct access to chiral α-allenic alcohols in an
  • toward electrophiles [14][15][16][17][18][19]. Consequently, all reported asymmetric catalytic aldehyde allenylation methods are currently limited to metal/metalloid reagents bearing R2 substituents [21][22][23][24][25][26][27][28][29][30][31][32][33][34], except for the methods with
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Published 25 Nov 2024

Chemical structure metagenomics of microbial natural products: surveying nonribosomal peptides and beyond

  • Thomas Ma and
  • John Chu

Beilstein J. Org. Chem. 2024, 20, 3050–3060, doi:10.3762/bjoc.20.253

Graphical Abstract
  • offloading step always entails the same chemical reaction, wherein nucleophilic attack is promoted by the catalytic triad of a TE via general base catalysis. This is likely why traditional mechanistic studies that focused on the enzyme active site failed to work out how TEs control NRP topology. A priori
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Perspective
Published 20 Nov 2024

Advances in radical peroxidation with hydroperoxides

  • Oleg V. Bityukov,
  • Pavel Yu. Serdyuchenko,
  • Andrey S. Kirillov,
  • Gennady I. Nikishin,
  • Vera A. Vil’ and
  • Alexander O. Terent’ev

Beilstein J. Org. Chem. 2024, 20, 2959–3006, doi:10.3762/bjoc.20.249

Graphical Abstract
  • recombination of IV with tert-butylperoxy radical provides the target product 22 (step J). The peroxidation of 2-oxoindoles 23, barbituric acids 25, and 4-hydroxycoumarins 27 by TBHP and α-cumyl hydroperoxide was carried out with the application of catalytic systems based on Co(II) [49], Mn(III) [50], and Fe(II
  • atom from substrate 53 to form the C-centered radical B. Copper(II) then oxidizes TBHP to form the tert-butylperoxy radical C and copper(I), closing the catalytic copper cycle. tert-Butylperoxy radical C recombines with radical B to yield the product 54. The reaction of a mono-substituted nitrile
  • excited state [*IrIII(ppy)3] is likely to initiate a plausible catalytic cycle. Then TBHP is reduced by [*IrIII(ppy)3] through SET, which results in the generation of the tert-butoxy radical. Subsequently, the tert-butoxy radical abstracts a hydrogen atom from substrate 68 to give radical A
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Published 18 Nov 2024

gem-Difluorovinyl and trifluorovinyl Michael acceptors in the synthesis of α,β-unsaturated fluorinated and nonfluorinated amides

  • Monika Bilska-Markowska,
  • Marcin Kaźmierczak,
  • Wojciech Jankowski and
  • Marcin Hoffmann

Beilstein J. Org. Chem. 2024, 20, 2946–2953, doi:10.3762/bjoc.20.247

Graphical Abstract
  • blocks [26]. Despite the known instability of trifluoromethylated carbanions [27], their catalytic application has yielded valuable products [28][29][30]. gem-Difluoroalkenes and trifluoroalkenes are excellent acceptors in the Michael addition reactions. There are also known examples of the use of gem
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Published 15 Nov 2024

4,6-Diaryl-5,5-difluoro-1,3-dioxanes as chiral dopants for liquid crystal compositions

  • Maurice Médebielle,
  • Peer Kirsch,
  • Jérémy Merad,
  • Carolina von Essen,
  • Clemens Kühn and
  • Andreas Ruhl

Beilstein J. Org. Chem. 2024, 20, 2940–2945, doi:10.3762/bjoc.20.246

Graphical Abstract
  • still remain elusive and are not well understood [29]. Recently we have become interested in the preparation of racemic [30] anti- and highly enantioenriched 2,2-difluoro-1,3-diols [30][31][32] through an acylative double catalytic kinetic resolution (DoCKR) process [33]. While the 1,3-diol motif is
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Published 14 Nov 2024

Recent advances in transition-metal-free arylation reactions involving hypervalent iodine salts

  • Ritu Mamgain,
  • Kokila Sakthivel and
  • Fateh V. Singh

Beilstein J. Org. Chem. 2024, 20, 2891–2920, doi:10.3762/bjoc.20.243

Graphical Abstract
  • easily recycled just by washing it with ethanol, retaining its catalytic activity for arylation up to three cycles without any compromise. Thus, this procedure could be considered economic as well as environment-friendly. In 2019, Kalek and co-workers reported the regioselective C–H arylation of 2
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Published 13 Nov 2024

Synthesis and antimycotic activity of new derivatives of imidazo[1,2-a]pyrimidines

  • Dmitriy Yu. Vandyshev,
  • Daria A. Mangusheva,
  • Khidmet S. Shikhaliev,
  • Kirill A. Scherbakov,
  • Oleg N. Burov,
  • Alexander D. Zagrebaev,
  • Tatiana N. Khmelevskaya,
  • Alexey S. Trenin and
  • Fedor I. Zubkov

Beilstein J. Org. Chem. 2024, 20, 2806–2817, doi:10.3762/bjoc.20.236

Graphical Abstract
  • of the catalytic activity of CYP51. A number of previous studies confirmed the efficacy of azole compounds and their derivatives against a variety of strains and clinical isolates of the genus Candida. Nevertheless, the increased use of azole antifungals for the therapy of both mucosal and systemic
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Published 05 Nov 2024

Mechanochemical difluoromethylations of ketones

  • Jinbo Ke,
  • Pit van Bonn and
  • Carsten Bolm

Beilstein J. Org. Chem. 2024, 20, 2799–2805, doi:10.3762/bjoc.20.235

Graphical Abstract
  • -depleting sulfur dioxide as side products [46][47]. Later, Ichikawa and co-workers established the release of difluorocarbene from TFDA with catalytic amounts of an N-heterocyclic carbene and a base (Scheme 1C) [29][48][49]. In these reactions, difluoromethyl enol ethers were obtained, which were
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Published 04 Nov 2024

Copper-catalyzed yne-allylic substitutions: concept and recent developments

  • Shuang Yang and
  • Xinqiang Fang

Beilstein J. Org. Chem. 2024, 20, 2739–2775, doi:10.3762/bjoc.20.232

Graphical Abstract
  • 350100, China 10.3762/bjoc.20.232 Abstract The catalytic (asymmetric) allylation and propargylation have been established as powerful strategies allowing access to enantioenriched α-chiral alkenes and alkynes. In this context, combining allylic and propargylic substitutions offers new opportunities to
  • catalytic center; finally, the selectivity affording E-enyne and Z-enyne product is also an issue to be addressed, and possible side reactions need to be suppressed (Scheme 2). In this review, we summarize the recent development of copper-catalyzed yne-allylic substitutions. It is worth noting that when we
  • ). Further control experiments and DFT calculations show that during the catalytic process, tertiary amine directly participates as a nucleophilic reagent to give the ammonium salt, which then releases dimethylaminium to provide the final product (Scheme 12). Chiral allylic sulfone compounds can be easily
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Review
Published 31 Oct 2024

5th International Symposium on Synthesis and Catalysis (ISySyCat2023)

  • Anthony J. Burke and
  • Elisabete P. Carreiro

Beilstein J. Org. Chem. 2024, 20, 2704–2707, doi:10.3762/bjoc.20.227

Graphical Abstract
  • intramolecular aminocarbonylation using Mo(CO)6. Both catalytic approaches successfully produced the desired DBDAPs. As previously mentioned, organic synthesis is a crucial tool for preparing complex molecules of high value to industry. Frackenpohl et al. [13] designed and synthesized a new library of 2,3
  • carbene (NHC) framework from polysubstituted aminoimidazo[5,1-b]oxazol-6-ium salts, which demonstrated strong catalytic activity in gold-catalyzed alkyne hydration and arylative cyclization reactions [14]. The synthesis of this new carbene involved the use of a novel nitrenoid reagent that was
  • time-consuming, complex, and expensive. Consequently, it is of utmost interest to immobilize them for reuse but without affecting their catalytic activity. The main factors discussed were the type of support, immobilization, and interaction between the support and the organocatalyst. The particular
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Editorial
Published 28 Oct 2024

Computational design for enantioselective CO2 capture: asymmetric frustrated Lewis pairs in epoxide transformations

  • Maxime Ferrer,
  • Iñigo Iribarren,
  • Tim Renningholtz,
  • Ibon Alkorta and
  • Cristina Trujillo

Beilstein J. Org. Chem. 2024, 20, 2668–2681, doi:10.3762/bjoc.20.224

Graphical Abstract
  • strategically modifying LB substituents to induce asymmetry, a stereoselective catalytic scaffold was developed, favouring one enantiomer from both epoxide enantiomers. This work advances the in silico design of FLPs, highlighting their potential as asymmetric CCU catalysts with implications for optimising
  • alkenes [10][11], they have since found applications in catalysis [12][13]. Among the first catalytic uses of FLPs were the hydrogenation of unsaturated compounds [12][14] and the reduction of CO2 using H2 as a reductant [7][15][16][17]. FLPs have become an attractive avenue for the reduction of CO2
  • catalysts located at the top. The top of the volcano plot corresponds to the scenario where the catalyst exhibits high catalytic activity, as it achieves an optimal balance in binding to the reactants, neither too strongly nor too weakly (Figure 1A, purple points). The catalysts with binding energies lower
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Published 22 Oct 2024

The scent gland composition of the Mangshan pit viper, Protobothrops mangshanensis

  • Jonas Holste,
  • Paul Weldon,
  • Donald Boyer and
  • Stefan Schulz

Beilstein J. Org. Chem. 2024, 20, 2644–2654, doi:10.3762/bjoc.20.222

Graphical Abstract
  • concentrated under a stream of N2. Hydrogenation: The solvent of the natural extract (100 µL) was removed with a stream of N2 and taken up in pentane (100 µL) and a catalytic amount of Pd/C was added. The reaction was then stirred for 1 h under a H2 atmosphere. The catalyst was filtered and rinsed with pentane
  • , catalytic amounts of 4-(dimethylamino)pyridine (DMAP) and freshly distilled 3-pyridinemethanol (1 drop) were added. The reaction mixture was heated to 60 °C for 1 h and filtered. The filtrate was washed three times with H2O, the organic phases were dried over sodium sulfate and filtered before GC–MS
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Published 18 Oct 2024

Efficient modification of peroxydisulfate oxidation reactions of nitrogen-containing heterocycles 6-methyluracil and pyridine

  • Alfiya R. Gimadieva,
  • Yuliya Z. Khazimullina,
  • Aigiza A. Gilimkhanova and
  • Akhat G. Mustafin

Beilstein J. Org. Chem. 2024, 20, 2599–2607, doi:10.3762/bjoc.20.219

Graphical Abstract
  • ][19][20]. The catalytic activity of metallophthalocyanines originates from their planar, cyclic structure with a developed π-conjugation system. This makes the fifth and sixth coordination sites of the central metal ion available for coordination with the reactant molecules of the catalytic reaction
  • -ammonium sulfate, probably due to the destruction of the pyrimidine ring. PcZn turned out to be the least active catalyst, resulting in a yield of MU-5-ammonium sulfate 2 of 72% (0.05 wt %). The catalysts’ activity decreased in the order of PcFe(II) > PcCo > PcFe(III) > PcMn > PcNi > PcZn. The catalytic
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Published 16 Oct 2024

A review of recent advances in electrochemical and photoelectrochemical late-stage functionalization classified by anodic oxidation, cathodic reduction, and paired electrolysis

  • Nian Li,
  • Ruzal Sitdikov,
  • Ajit Prabhakar Kale,
  • Joost Steverlynck,
  • Bo Li and
  • Magnus Rueping

Beilstein J. Org. Chem. 2024, 20, 2500–2566, doi:10.3762/bjoc.20.214

Graphical Abstract
  • products were obtained in good yields (51–81%). The reaction involves the catalytic dehydrochlorination of DCE at the cathode, simultaneously with anodic oxidative aromatic chlorination using cathodically released HCl as the chloride source (Scheme 13). Additionally, the Lei group demonstrated a double
  • − is protonated to produce DDQH2. The anodic oxidation of DDQH2 regenerates DDQ, which re-enters the catalytic cycle (Scheme 29). Furthermore, Qiu and coworkers disclosed a metal-free electrochemical dihydroxylation of unactivated alkenes using water as the hydroxy source under air conditions [40
  • ). In 2023, the Guo group reported the enantioselective cross-dehydrogenative amination via electrochemical oxidation of C–H and N–H bonds, successfully achieved the LSF of several bioactive molecules and natural products with good yields and high stereoselectivities [50]. The plausible catalytic
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Published 09 Oct 2024

Visible-light-mediated flow protocol for Achmatowicz rearrangement

  • Joachyutharayalu Oja,
  • Sanjeev Kumar and
  • Srihari Pabbaraja

Beilstein J. Org. Chem. 2024, 20, 2493–2499, doi:10.3762/bjoc.20.213

Graphical Abstract
  • -prefunctionalized materials in order to proceed with the rearrangement. However, the Achmatowicz reaction or similar methodologies involve a catalytic to stoichiometric amount of oxidants such as m-CPBA [7], PCC [8], Br2 [9], NBS [10], DMDO [11], KBr/Oxone [12], Na2S2O8 [13], photosensitizers/O21 [14], or Me2S [15
  • corresponding products (3o, 3p) in good yields. All the products obtained were characterized by 1H NMR, 13C NMR and mass spectrometry techniques. A plausible catalytic cycle has been postulated based on a literature study [13], and is shown in Figure 2. With the exposure of photocatalyst to sunlight/LED light
  • , [Ru(bpy)3]2+ undergoes transition to [Ru(bpy)3]2+* which is quenched by persulfate resulting in [Ru(bpy)3]3+ along with the simultaneous generation of sulfate and a sulfate radical. SET from furfuryl alcohol closes the catalytic cycle of the PC and an intermediate A is generated with L (L = SO4−· or
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Published 08 Oct 2024

HFIP as a versatile solvent in resorcin[n]arene synthesis

  • Hormoz Khosravi,
  • Valeria Stevens and
  • Raúl Hernández Sánchez

Beilstein J. Org. Chem. 2024, 20, 2469–2475, doi:10.3762/bjoc.20.211

Graphical Abstract
  • efficient solvent for synthesizing resorcin[n]arenes in the presence of catalytic amounts of HCl at ambient temperature and within minutes. Remarkably, resorcinols with electron-withdrawing groups and halogens, which are reported in the literature as the most challenging precursors in this cyclization, are
  • as the catalyst (Table 1, entries 1–4). The removal of HCl from the reaction conditions unveiled the crucial role of the catalyst in the process (Table 1, entry 5), which was expected; however, note that here we use the acid in catalytic amounts and not in excess as reported in the literature [73][74
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Published 02 Oct 2024

Facile preparation of fluorine-containing 2,3-epoxypropanoates and their epoxy ring-opening reactions with various nucleophiles

  • Yutaro Miyashita,
  • Sae Someya,
  • Tomoko Kawasaki-Takasuka,
  • Tomohiro Agou and
  • Takashi Yamazaki

Beilstein J. Org. Chem. 2024, 20, 2421–2433, doi:10.3762/bjoc.20.206

Graphical Abstract
  • its convenient handling and availability at a low cost. Following to the reported protocol [41], although a catalytic amount of Al2O3 and MgO worked nicely (entries 1 and 2 in Table 1), it was clarified that these additives were not necessary for the attainment of the same level of chemical yields
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Published 25 Sep 2024

Evaluating the halogen bonding strength of a iodoloisoxazolium(III) salt

  • Dominik L. Reinhard,
  • Anna Schmidt,
  • Marc Sons,
  • Julian Wolf,
  • Elric Engelage and
  • Stefan M. Huber

Beilstein J. Org. Chem. 2024, 20, 2401–2407, doi:10.3762/bjoc.20.204

Graphical Abstract
  • resulting order of catalytic activity of these halogen-bond donors is in line with the above-mentioned previous benchmark of these activators [13]. Finally, also the new iodoloisoxazolium salt 7BArF was applied and a comparably high activity was observed (ca. 85% conversion after 2 h). This result marks
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Published 23 Sep 2024

Asymmetric organocatalytic synthesis of chiral homoallylic amines

  • Nikolay S. Kondratyev and
  • Andrei V. Malkov

Beilstein J. Org. Chem. 2024, 20, 2349–2377, doi:10.3762/bjoc.20.201

Graphical Abstract
  • ,β-unsaturated imines 9. However, with ethynylimines 12, the enantioselectivity dropped to a modest level. In addition, the reaction with sterically hindered tertiary allylboronates, such as the chiral (R)-α-cyclohexyl-α-methyl-allylboronate required the use of catalytic amounts of zinc tert-butoxide
  • ) required an extended reaction time (10 days). The relatively low activity of the sulphonamide catalyst 45 also necessitates higher loadings of 10 mol % (Scheme 10). In 2019, a novel catalytic approach to homoallylic N-carbamoylamino esters 50 was described by Jacobsen and co-workers [34]. This allylation
  • concerted SN2 mechanism or SN1 mechanism with the allyl nucleophile addition step as rate-determining. Interestingly, the authors observed a 0.55 order in the catalyst, which indicates that a substantial part of the catalyst forms a hydrogen-bonded dimer with Kdiss ≈ 1000 M−1 when not in the catalytic cycle
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Published 16 Sep 2024

Stereoselective mechanochemical synthesis of thiomalonate Michael adducts via iminium catalysis by chiral primary amines

  • Michał Błauciak,
  • Dominika Andrzejczyk,
  • Błażej Dziuk and
  • Rafał Kowalczyk

Beilstein J. Org. Chem. 2024, 20, 2313–2322, doi:10.3762/bjoc.20.198

Graphical Abstract
  • -based catalytic system for the highly stereoselective addition of various bisthiomalonates to chalcones and dienones [29]. While recognizing the potential for greater selectivity enhancement and time savings with ball milling, hydrogen-bonding catalysis was effective only with aromatic enones, yielding
  • significant enhancement of catalytic system efficiency and results from the dramatic decrease in enantioselectivity observed in mill reactions. Additionally, the catalyst’s synthesis requires an extra synthetic step. We decided to conduct further investigations utilizing system A or its modifications. First
  • , changes in the epi-amino alkaloid core of the two-component catalytic system were investigated. Introduction of the 2’-substitution to the quinine core as in AQ-2 and AQ-4 (Scheme 2) resulted in the decrease of chirality transfer providing the product with 50% and 72% ee, respectively. A similar trend was
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Published 12 Sep 2024

Catalysing (organo-)catalysis: Trends in the application of machine learning to enantioselective organocatalysis

  • Stefan P. Schmid,
  • Leon Schlosser,
  • Frank Glorius and
  • Kjell Jorner

Beilstein J. Org. Chem. 2024, 20, 2280–2304, doi:10.3762/bjoc.20.196

Graphical Abstract
  • optimization algorithm allowed them to discover multiple trade-off optima, enabling a scientist to select the ideal catalyst based on the specific requirements of catalytic activity and selectivity, while still accounting for catalyst generality through design of the objectives. Noticeably, data analysis
  • witnessed a surge in data-driven approaches to improve the design of reactions, e.g., by inferring mechanistic features through statistical modelling, the generation of catalyst structures with increased catalytic activity, or optimising the reaction conditions to maximise the yield or selectivity. In
  • of the key catalytic steps [23][139][140][141][142] and commonly uses calculated or measured physical parameters of reaction components to make decisions in a design effort. In line with the early developments of statistical modelling through Hammett parameters to correlate substrate properties to
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Published 10 Sep 2024

Deuterated reagents in multicomponent reactions to afford deuterium-labeled products

  • Kevin Schofield,
  • Shayna Maddern,
  • Yueteng Zhang,
  • Grace E. Mastin,
  • Rachel Knight,
  • Wei Wang,
  • James Galligan and
  • Christopher Hulme

Beilstein J. Org. Chem. 2024, 20, 2270–2279, doi:10.3762/bjoc.20.195

Graphical Abstract
  • modification of 1d, representative of the large swath of chemical space accessible by Ugi-deprotect-cyclize (UDC) methodology, gave the dihydroquinoxaline 1g in good yield with high deuterium retention [29][30][31][32]. The catalytic three-component Ugi reaction was first reported by List in 2008 [33][34] and
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Published 06 Sep 2024

gem-Difluorination of carbon–carbon triple bonds using Brønsted acid/Bu4NBF4 or electrogenerated acid

  • Mizuki Yamaguchi,
  • Hiroki Shimao,
  • Kengo Hamasaki,
  • Keiji Nishiwaki,
  • Shigenori Kashimura and
  • Kouichi Matsumoto

Beilstein J. Org. Chem. 2024, 20, 2261–2269, doi:10.3762/bjoc.20.194

Graphical Abstract
  • HF is still inevitable [40][41]. Quite recently, Crimmin and co-workers reported gem-difluorination by shuttling between fluoroalkanes and alkynes, in which catalytic HF played a key role [42]. In the course of our study on the fluorination reaction, we have envisioned that the combination of a
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Published 06 Sep 2024

Electrochemical allylations in a deep eutectic solvent

  • Sophia Taylor and
  • Scott T. Handy

Beilstein J. Org. Chem. 2024, 20, 2217–2224, doi:10.3762/bjoc.20.189

Graphical Abstract
  • limitation by using electrochemistry with catalytic amounts of metal or perhaps by recovering and recycling the metal with a recyclable solvent was the goal motivating this project. With this as a background, we undertook an investigation of electrochemical allylation in DES. Results and Discussion While
  • reducing the waste generated in these allylations. While non-sacrificial graphite electrodes had failed to result in any reaction, it seemed possible that the use of a catalytic amount of tin metal or a tin salt with graphite electrodes would result in a superior reaction due to in situ reduction and/or
  • . While the DES clearly had some ability to be recycled, the use of catalytic amounts of metal had uniformly failed. Recognizing that DES have been used extensively for electroplating and metal deposition, though it seemed that this might provide an opportunity for metal recovery and reuse [19]. To this
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Published 02 Sep 2024
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