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Search for "reactions" in Full Text gives 3077 result(s) in Beilstein Journal of Organic Chemistry. Showing first 200.

Synthesis of fluorinated acid-functionalized, electron-rich nickel porphyrins

  • Mike Brockmann,
  • Jonas Lobbel,
  • Lara Unterriker and
  • Rainer Herges

Beilstein J. Org. Chem. 2024, 20, 2954–2958, doi:10.3762/bjoc.20.248

Graphical Abstract
  • –CH2–(CF2)n–COOCH3) with triflate as leaving group in terminal position are easily accessible and versatile building blocks for attaching long chain acids (pKa 0–1) to substrates in Williamson ether-type reactions. Keywords: acid-functionalized porphyrin; electron-rich porphyrin; nickel porphyrin
  • ]. Beyond their essential biological roles, porphyrins and their derivatives are employed in a number of applications, acting as catalysts in numerous reactions, including oxidation, reduction, and cycloaddition [6][7][8][9][10]. Particularly when electron-rich porphyrins act as reducing agents, e.g. in
  • electrocatalytic hydrogen evolution reactions, a proton source is needed [11]. In this context, trifluoroacetic acid is very frequently chosen as the proton source, because it is a strong acid but just not strong enough to destroy (demetallate) the Ni porphyrin [10]. Covalent attachment of acids facilitates proton
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Published 15 Nov 2024

Structure and thermal stability of phosphorus-iodonium ylids

  • Andrew Greener,
  • Stephen P. Argent,
  • Coby J. Clarke and
  • Miriam L. O’Duill

Beilstein J. Org. Chem. 2024, 20, 2931–2939, doi:10.3762/bjoc.20.245

Graphical Abstract
  • will stimulate the design and synthesis of new hypervalent iodine compounds, expanding the functionalisation reactions currently available through these useful reagents in organic synthesis. Structure and stability of hypervalent iodine compounds. Phosphorus-iodonium ylids investigated in this study
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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
  • concentrate on various arylation reactions involving carbon and other heteroatoms, encompassing rearrangement reactions in the absence of any metal catalyst, and summarize advancements made in the last five years. Keywords: arylation reaction; diaryliodonium salts; electrophilic arylation reagent; metal-free
  • five to seven-membered cyclic compounds [47]. Arylation reactions using diaryliodonium salts can occur through four distinct mechanisms. First, the arylation can occur under metal-free conditions, involving the formation of a three-membered ring transition state through ligand coupling, leading to the
  • upon binding of the enolate molecule to iodine either through a carbon–iodine or an oxygen–iodine bond. Both intermediates, I and II, are in rapid equilibrium with each other and further undergo two different types of reactions: [1,2]-ligand coupling and [2,3]-rearrangement (Scheme 2). Either of these
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Published 13 Nov 2024

C–H Trifluoromethylthiolation of aldehyde hydrazones

  • Victor Levet,
  • Balu Ramesh,
  • Congyang Wang and
  • Tatiana Besset

Beilstein J. Org. Chem. 2024, 20, 2883–2890, doi:10.3762/bjoc.20.242

Graphical Abstract
  • reaction conditions, electron-enriched hydrazones provided the expected products in high yields (2a, 3a, 4a). Note, that in the case of the N-tosylhydrazone, further optimization reactions were required (for more details, see Supporting Information File 1), and reducing the temperature for the halogenation
  • , alkenes) and halogens allowing an array of post-functionalization reactions. Finally, the trifluoromethylthiolation of molecules derived from compounds of interest was achieved to illustrate the synthetic utility of the method. Hence, the desired products 2v–x were efficiently isolated. To get more
  • ), NBS (0.33 mmol, 1.1 equiv) in CH3CN (0.4 M), 20 °C, 10 min; then, AgSCF3 (0.6 mmol, 2.0 equiv), 2 h, under argon. a0.15 mmol reaction scale. bProduct 2v was isolated with an inseparable impurity. Mechanistic investigations and post-functionalization reactions. a19F NMR yields using α,α,α
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Published 12 Nov 2024

Synthesis of pyrrole-fused dibenzoxazepine/dibenzothiazepine/triazolobenzodiazepine derivatives via isocyanide-based multicomponent reactions

  • Marzieh Norouzi,
  • Mohammad Taghi Nazeri,
  • Ahmad Shaabani and
  • Behrouz Notash

Beilstein J. Org. Chem. 2024, 20, 2870–2882, doi:10.3762/bjoc.20.241

Graphical Abstract
  • great attention in biomedical applications, clinical diagnostics, and conjugate materials. Keywords: cyclic imines; dibenzothiazepine; dibenzoxazepine; isocyanides; multicomponent reactions; pyrrole; triazolobenzodiazepine; Introduction Pyrroles and their derivatives are important N-heterocyclic
  • /benzoxazepine/benzothiazepine is very important. Due to the wide applications of pyrrole-fused heterocycles, very diverse approaches have been developed for their synthesis [28][29][30][31][32]. In recent years, multicomponent reactions (MCRs) have emerged as one of the most efficient and powerful methods to
  • achieve this goal [7][33]. Among them, isocyanide-based multicomponent reactions (I-MCRs) are one of the well-known strategies in this field due to their operational simplicity, one-pot, convergent properties and atom economy, high efficiency, and high levels of chemical selectivity [34][35][36]. In
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Published 11 Nov 2024

N-Glycosides of indigo, indirubin, and isoindigo: blue, red, and yellow sugars and their cancerostatic activity

  • Peter Langer

Beilstein J. Org. Chem. 2024, 20, 2840–2869, doi:10.3762/bjoc.20.240

Graphical Abstract
  • of n-propyl mercaptane with subsequent addition of acetic anhydride, pyridine and KHF2 afforded indigo-N-rhamnoside 5c as a 2:1 mixture of α/β-anomers. The relatively low yield is a result of side reactions and decomposition, due to the rather unstable nature of the product. The reaction of 5c with
  • corresponding acetyl-protected N-glycosyl anilines with oxalyl chloride was not possible. The failure of this reaction can be explained by electronic deactivation of the aromatic ring and steric hindrance which resulted in competing Claisen-type side-reactions of the acetyl groups. However, reactions of
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Published 08 Nov 2024

Multicomponent synthesis of α-branched amines using organozinc reagents generated from alkyl bromides

  • Baptiste Leroux,
  • Alexis Beaufils,
  • Federico Banchini,
  • Olivier Jackowski,
  • Alejandro Perez-Luna,
  • Fabrice Chemla,
  • Marc Presset and
  • Erwan Le Gall

Beilstein J. Org. Chem. 2024, 20, 2834–2839, doi:10.3762/bjoc.20.239

Graphical Abstract
  • amines. Interestingly, whereas previously reported work describing the preparation and reaction of organozinc iodides in acetonitrile showed higher reactivity of secondary organozinc reagents over primary ones, reactions in THF in the presence of LiCl led to opposite results, with higher reactivity of
  • bromides in order to explore their consecutive use in multicomponent Mannich reactions (Table 1). While our experience in the development of multicomponent reactions involving organozinc compounds prompted us to initially consider acetonitrile as probably the most adapted solvent for the whole process [26
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Published 07 Nov 2024

Synthesis of tricarbonylated propargylamine and conversion to 2,5-disubstituted oxazole-4-carboxylates

  • Kento Iwai,
  • Akari Hikasa,
  • Kotaro Yoshioka,
  • Shinki Tani,
  • Kazuto Umezu and
  • Nagatoshi Nishiwaki

Beilstein J. Org. Chem. 2024, 20, 2827–2833, doi:10.3762/bjoc.20.238

Graphical Abstract
  • ] because of their easily modifiable dipeptide frameworks. Several methods exist for accessing PCPAs, such as the amination of 1-halo-1-alkynes [16][17], tandem reactions of α-imino esters with nucleophiles and electrophiles [18], and the nucleophilic addition of an acetylide to α-carbonylated N-acylimines
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Published 06 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
  • spectroscopy, HPLC–HRESIMS) of the products of the investigated reactions unambiguously confirms the processes proceeding along routes A1 and B1 with the formation of N-aryl(alkyl)-7-oxo-5,6,7,8-tetrahydroimidazo[1,2-a]pyrimidin-5-carboxamides 4a–i and N-aryl-2-(7-oxo-5,6,7,8-tetrahydroimidazo[1,2-a]pyrimidin
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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
  • efficiently converted to the target products under solvent-free conditions. The reactions proceed at room temperature and are complete within 90 minutes, demonstrating both efficiency and experimental simplicity. Keywords: ball milling; difluorocarbene; difluoromethylations; difluoromethyl enol ether
  • ; mechanochemistry; Introduction In recent years, mechanochemical organic synthesis has been advanced significantly, prompting organic chemists to reconsider the necessity of solvents in their reactions [1][2][3][4][5][6][7][8][9][10][11]. Eliminating hazardous solvents substantially reduces the ecological
  • footprint of organic reactions [12][13]. Beyond environmental benefits and enhanced human safety, mechanochemical reactions often feature shorter reaction times, eliminate the need for external heating, and offer alternative product selectivity [3][14]. In general, such reactions are characterized by the
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Published 04 Nov 2024

C–C Coupling in sterically demanding porphyrin environments

  • Liam Cribbin,
  • Brendan Twamley,
  • Nicolae Buga,
  • John E. O’ Brien,
  • Raphael Bühler,
  • Roland A. Fischer and
  • Mathias O. Senge

Beilstein J. Org. Chem. 2024, 20, 2784–2798, doi:10.3762/bjoc.20.234

Graphical Abstract
  • , Germany 10.3762/bjoc.20.234 Abstract Unlike their planar counterparts, classic synthetic protocols for C–C bond forming reactions on nonplanar porphyrins are underdeveloped. The development of C–C bond forming reactions on nonplanar porphyrins is critical in advancing this field of study for more complex
  • ][25], Negishi [26], and Kumada [27] coupling reactions, as well as modern iridium and rhodium-based coupling techniques [28], are just some examples of the C–C bond formations that have been implemented to achieve complex substitution patterns and functional arrangements on porphyrins. Of these named
  • coupling reactions, Suzuki–Miyaura couplings are known to be a robust tool when functionalizing porphyrins [29][30]. Many complex porphyrinoid architectures have been synthesized in this manner, from functional porphyrin arrays [31][32][33] to sterically challenging meso-substituted aryl bis-pocket
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Published 04 Nov 2024

Access to optically active tetrafluoroethylenated amines based on [1,3]-proton shift reaction

  • Yuta Kabumoto,
  • Eiichiro Yoshimoto,
  • Bing Xiaohuan,
  • Masato Morita,
  • Motohiro Yasui,
  • Shigeyuki Yamada and
  • Tsutomu Konno

Beilstein J. Org. Chem. 2024, 20, 2776–2783, doi:10.3762/bjoc.20.233

Graphical Abstract
  • ]. As a diastereoselective synthesis, reductive coupling reactions of commercially available 4-bromo-3,3,4,4-tetrafluoro-1-butene and glyceraldehyde 10a, its imine derivative 11, or Garner's aldehyde 10b have been reported [23][24]. Although the diastereoselectivities were low in some cases, the
  • diastereomers 12 and 13 are often easily separable, and each diastereomer of optically active alcohols or amines can be obtained with an excellent optical purity (reactions 3 and 4 in Scheme 1). To the best of our knowledge, these are the only four works for the preparation of optically active substances having
  • fluoroalkylated amines 15 with high optical purity could be easily prepared through [1,3]-proton shift reactions of optically active imines 14 which in turn were readily synthesized by condensation of various perfluoroalkyl ketones with optically active (R)-1-phenylethylamine (Scheme 2a) [25][26][27][28][29][30
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Published 01 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
  • expand the scope of transition metal-catalyzed substitution reactions. Since its discovery in 2022, copper-catalyzed yne-allylic substitution has undergone rapid development and significant progress has been made using the key copper vinyl allenylidene intermediates. This review summarizes the
  • terminal alkyne is the active species in the reactions. In this regard, merging the unique feature of Cu-catalyzed propargylic substitution with allylic substitution is a feasible solution to the challenge, which will represent a new sort of substitution reaction. From 2022, the Cu-catalyzed yne-allylic
  • 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
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Published 31 Oct 2024

Synthesis of spiroindolenines through a one-pot multistep process mediated by visible light

  • Francesco Gambuti,
  • Jacopo Pizzorno,
  • Chiara Lambruschini,
  • Renata Riva and
  • Lisa Moni

Beilstein J. Org. Chem. 2024, 20, 2722–2731, doi:10.3762/bjoc.20.230

Graphical Abstract
  • : isocyanide; multicomponent reactions; one-pot reaction; oxidation; spiroindolenine; Ugi reaction; visible light; Introduction Diversity-oriented synthesis (DOS) is a successful approach to biologically active scaffolds directed to create an enormous exploratory space in pharmaceutical hit discovery [1][2
  • spiro-heterocyclic indolenines from readily available starting materials under mild conditions and in a diversity-oriented fashion remains desirable. In this contest, oxidative isocyanide-based multicomponent reactions (oxidative IMCRs) can be considered as a convenient tool [15]. Actually, the use of
  • efficient methods for the synthesis of heterocycles by multicomponent processes and domino reactions [16][17][18][19][20], here we disclosed the oxidative one-pot four-step synthesis of 2-amino-3,3’-spiroindolenines using readily available tertiary amines, electron-rich anilines and isocyanides as starting
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Published 29 Oct 2024

Young investigators in natural products chemistry, biosynthesis, and enzymology

  • Jeffrey D. Rudolf,
  • Lena Barra and
  • Takayoshi Awakawa

Beilstein J. Org. Chem. 2024, 20, 2720–2721, doi:10.3762/bjoc.20.229

Graphical Abstract
  • . Their privileged structures have led organic and bioorganic chemists to develop methods to construct them. Our fundamental knowledge in enzymology is continually expanded by enzymes involved in natural products biosynthesis, as their production requires evolved enzymes to perform chemical reactions
  • clusters, and enzymes, development of chemical probes, biocatalysis and chemoenzymatic total synthesis, enzymatic mechanisms, and computational investigations of chemical structures and reactions. All of the major classes of natural products are represented here: nonribosomal peptides, ribosomally
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Published 29 Oct 2024

Synthesis of benzo[f]quinazoline-1,3(2H,4H)-diones

  • Ruben Manuel Figueira de Abreu,
  • Peter Ehlers and
  • Peter Langer

Beilstein J. Org. Chem. 2024, 20, 2708–2719, doi:10.3762/bjoc.20.228

Graphical Abstract
  • and Suzuki–Miyaura cross-coupling reactions followed by Brønsted acid-mediated cycloisomerisation. The developed methodology tolerates various functional groups and leads to moderate up to quantitative yields of the final products. The impact of different functional groups on the optical properties
  • reactions (Figure 1). Polycondensed heterocycles containing a uracil moiety have also been studied in recent years. For example, compound A exhibits antitumor and antimicrobial properties (Figure 2) [66][67]. Compounds A and B are used as starting materials for the synthesis of polyaromatic derivatives of
  • of palladium-catalysed Sonogashira–Hagihara and Suzuki–Miyaura cross-coupling reactions (Scheme 1). The final cyclisation step is accomplished by an acid-mediated cycloisomerisation. The synthesis of starting materials 4 was carried out by our previously reported protocol [65]. While compounds 4a–f
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Published 28 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
  • ) derivatives, which possess recognized pharmacological properties [12]. They used sequential reactions catalyzed by palladium and copper. The process involves an initial amination, which can be carried out via either the Buchwald–Hartwig or the Chan–Lam reaction, followed by a palladium-catalyzed
  • 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
  • successfully synthesized on a gram scale through a three-step reaction sequence. The process began with 2,6-diisopropylphenylamine, which underwent alkylation, formylation, and substitution reactions. The carbene synthesis was then achieved via a two-step process involving ynamide annulation, followed by
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Published 28 Oct 2024

Synthesis of fluoroalkenes and fluoroenynes via cross-coupling reactions using novel multihalogenated vinyl ethers

  • Yukiko Karuo,
  • Keita Hirata,
  • Atsushi Tarui,
  • Kazuyuki Sato,
  • Kentaro Kawai and
  • Masaaki Omote

Beilstein J. Org. Chem. 2024, 20, 2691–2703, doi:10.3762/bjoc.20.226

Graphical Abstract
  • fluoroenynes via Suzuki–Miyaura and Sonogashira cross-coupling reactions using novel multihalogenated fluorovinyl ethers, which are easily prepared from the reaction between phenols and 2-bromo-2-chloro-1,1,1-trifluoroethane (halothane). These reactions make use of the unique structure of multihalogenated
  • fluorovinyl ethers, which contains a reactive bromine atom, to afford a series of fluoroalkenes and fluoroenynes in moderate to high yields. Keywords: fluoroalkenes; fluoroenynes; multihalogenated vinyl ethers; Suzuki–Miyaura cross-coupling reactions; Sonogashira cross-coupling reactions; Introduction
  • blocks. When using them as nucleophilic reagents [15][16][17][18][19][20], the reaction between anion species, such as fluorine-containing Horner–Wadsworth–Emmons reagents, and carbonyl compounds led to E-selective olefination (Scheme 1A) [15]. On the other hand, some reactions with electrophilic
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Published 24 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
  • . These limitations suggest that a more viable approach to employing FLPs as catalysts for CO2-related reactions could involve their use in CO2 activation [7][18][19]. In particular, the capture of CO2 by FLPs enhances the electrophilicity of the CO2 carbon atom and the nucleophilicity of one of the CO2
  • free energy correction at double-zeta. The kinetics of some reactions were calculated, applying the transition state theory [40]. Within this theory, the rate constant of an elementary reaction with the free energy barrier ΔG‡ is given by Equation 1, where k is the rate constant in s−1, kB is the
  • favourable process. During the study, it will be observed that several transition states (TSs) can lead to the same product. As there is no possible interconversion between the reactant states, the different reactions will be considered independent, and it will be necessary to use an effective rate constant
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Published 22 Oct 2024

Transition-metal-free decarbonylation–oxidation of 3-arylbenzofuran-2(3H)-ones: access to 2-hydroxybenzophenones

  • Bhaskar B. Dhotare,
  • Seema V. Kanojia,
  • Chahna K. Sakhiya,
  • Amey Wadawale and
  • Dibakar Goswami

Beilstein J. Org. Chem. 2024, 20, 2655–2667, doi:10.3762/bjoc.20.223

Graphical Abstract
  • long time to complete. Hence, it was established that only those solvents which can produce hydroperoxides in situ were suitable for the reaction. Therefore, we chose Cs2CO3 as the base of choice, and performed the further reactions using 1.0 equiv of Cs2CO3 in THF at 50 °C in an open atmosphere
  • NMR spectrum was consistent with the generation of tetrahydrofuran-2-hydroperoxide in THF, and was similar to the NMR reported earlier [25]. Further, the reaction of 3ba was scaled up to demonstrate the synthetic utility of our protocol. The reactions involving hydroperoxides are known to be difficult
  • to scale-up due to their violent reactions at elevated temperatures. Our protocol involved mild conditions, and to our expectations, a gram-scale conversion of 3ba to 4ba proceeded smoothly without appreciable loss in the reaction yield (Scheme 3). The reduced reaction time and a lower reaction
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Published 21 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
  • -dimethylalk-5-enoates in a homologous series from C11–C16, were characterized by GC–MS and GC–IR analysis and various microderivatization reactions including hydrogenation and esterification leading to methyl and pyridylmethyl esters. In addition, dimethyloxazoline formation helped to localize the double bond
  • distilled before use. All other chemicals were used without purification unless otherwise stated. Air- and H2O-sensitive reactions were performed under N2. ASAP-APCI-MS was performed on an Expression MS (Advion) mass spectrometer equipped with an APCI ionization source operated in positive mode. The
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Published 18 Oct 2024

Deciphering the mechanism of γ-cyclodextrin’s hydrophobic cavity hydration: an integrated experimental and theoretical study

  • Stiliyana Pereva,
  • Stefan Dobrev,
  • Tsveta Sarafska,
  • Valya Nikolova,
  • Silvia Angelova,
  • Tony Spassov and
  • Todor Dudev

Beilstein J. Org. Chem. 2024, 20, 2635–2643, doi:10.3762/bjoc.20.221

Graphical Abstract
  • (Table 1, reactions 8 and 10) can be interpreted as the attachment of water molecules that are already located in the ε = 78 medium rather than inside the hydrophobic cavity of γ-CD. Furthermore, a close examination of the optimized structures of the γ-CD hydrates (Figure 3) reveals that the carrier
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Published 17 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
  • : oxidation; 6-methyluracil; peroxydisulfate; phthalocyanine catalysts; pyridine; Introduction The Elbs and Boyland–Sims peroxydisulfate oxidation reactions offer a convenient means of introducing the hydroxy function into phenols and aromatic amines [1]. The oxidation of phenol using peroxydisulfate was
  • of hydroxy groups into various compound classes an attractive option. However, both reactions suffer from a significant downside – low yields of target products, rendering them unsuitable for industrial application. Considering the practical value of the products, as well as the simplicity and
  • convenience of the process, our objective is to enhance the efficiency of the Elbs and Boyland–Sims peroxydisulfate oxidation reactions. Results and Discussion We conducted research to enhance the product yield of peroxydisulfate oxidation reactions of specific nitrogen-containing heterocyclic compounds, such
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Published 16 Oct 2024

Synthesis and cytotoxicity studies of novel N-arylbenzo[h]quinazolin-2-amines

  • Battini Veeraiah,
  • Kishore Ramineni,
  • Dabbugoddu Brahmaiah,
  • Nangunoori Sampath Kumar,
  • Hélène Solhi,
  • Rémy Le Guevel,
  • Chada Raji Reddy,
  • Frédéric Justaud and
  • René Grée

Beilstein J. Org. Chem. 2024, 20, 2592–2598, doi:10.3762/bjoc.20.218

Graphical Abstract
  • has not been used earlier, should offer attractive potentialities in bioorganic and medicinal chemistry. Extension of these studies are ongoing in our laboratories and corresponding results will be reported in due course. Experimental Chemical synthesis General information All reactions were performed
  • traces of residual moisture. Reactions were monitored by thin-layer chromatography (TLC) using E. Merck silica gel plates and components were visualized by illumination with short wavelength UV light and/or staining (ninhydrin or basic KMnO4). All aldehydes were distilled right before use. All aryl
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Published 14 Oct 2024

Base-promoted cascade recyclization of allomaltol derivatives containing an amide fragment into substituted 3-(1-hydroxyethylidene)tetronic acids

  • Andrey N. Komogortsev,
  • Constantine V. Milyutin and
  • Boris V. Lichitsky

Beilstein J. Org. Chem. 2024, 20, 2585–2591, doi:10.3762/bjoc.20.217

Graphical Abstract
  • -hydroxypyran-4-ones these products are widely used in organic synthesis [17][18][19][20][21][22][23]. Among the diverse chemical transformations of allomaltol derivatives the recyclizations of the pyranone ring are of great interest. As a rule, such reactions are realized under action of nitrogen-containing
  • the reactions that require heating. General experimental procedure for the synthesis of tetronic acids 4 A mixture of corresponding amide 3 (1 mmol) and 1,1-carbonyldiimidazole (0.49 g, 3 mmol) was stirred in acetonitrile (7 ml) for 5 min at room temperature, then DBU (0.17 g, 1.1 mmol) was added and
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Published 14 Oct 2024
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