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Search for "iodine(III)" in Full Text gives 67 result(s) in Beilstein Journal of Organic Chemistry.

Electrochemical synthesis of cyclic biaryl λ3-bromanes from 2,2’-dibromobiphenyls

  • Andrejs Savkins and
  • Igors Sokolovs

Beilstein J. Org. Chem. 2025, 21, 451–457, doi:10.3762/bjoc.21.32

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  • approach would conceptually differ from previously reported anodic syntheses of cyclic diaryl iodonium compounds, where an electrochemically generated acyclic iodine(III) intermediate undergoes an intramolecular SEAr-type reaction to form the cyclic product [19][20]. Herein, we report on the development of
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Published 27 Feb 2025

Recent advances in organocatalytic atroposelective reactions

  • Henrich Szabados and
  • Radovan Šebesta

Beilstein J. Org. Chem. 2025, 21, 55–121, doi:10.3762/bjoc.21.6

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Published 09 Jan 2025

Reactivity of hypervalent iodine(III) reagents bearing a benzylamine with sulfenate salts

  • Beatriz Dedeiras,
  • Catarina S. Caldeira,
  • José C. Cunha,
  • Clara S. B. Gomes and
  • M. Manuel B. Marques

Beilstein J. Org. Chem. 2024, 20, 3281–3289, doi:10.3762/bjoc.20.272

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  • . A plausible mechanism is proposed, suggesting a possible radical pathway. Keywords: electrophilic amination; hypervalent iodine reagents; sulfinamide; sulfonamide; Introduction Iodine(III) compounds, known as λ3-iodanes, have been extensively applied in organic synthesis. Although initially used
  • as strong oxidizing agents [1], during the last decades HIRs have been investigated as group-transfer reagents, useful in several bond-forming reactions, such as in C–C, C–N, and C–O [2][3][4][5]. The benziodoxol(on)e family, cyclic iodine(III) reagents, stands out for their thermal stability and
  • VIII (named BBX), and investigated its reactivity on the α-amination of indanone-based β-ketoesters (Scheme 1) [4]. Very recently, Minakata’s group also reported iodine(III) reagents with transferable amino groups, particularly a benziodoxolone bearing a transferable NH2 group (IX) [20]. HIRs have been
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Published 19 Dec 2024

Hypervalent iodine-mediated intramolecular alkene halocyclisation

  • Charu Bansal,
  • Oliver Ruggles,
  • Albert C. Rowett and
  • Alastair J. J. Lennox

Beilstein J. Org. Chem. 2024, 20, 3113–3133, doi:10.3762/bjoc.20.258

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  • formed a range of 5-iodomethyl-2-aryloxazolines 84 in good yields (Scheme 45). In addition to the synthesis of brominated morpholines, Wang and co-workers reported the synthesis of chiral iodinated morpholines 85 (Scheme 46) [56]. Using an amino acid-derived chiral iodine(III) reagent with KI and NaOAc
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Published 28 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

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  • Andrew Greener Stephen P. Argent Coby J. Clarke Miriam L. O'Duill School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK 10.3762/bjoc.20.245 Abstract Hypervalent iodine(III) reagents have become indispensable tools in organic synthesis, but gaps remain in the
  • and potential decomposition pathways will enable the future design and development of new reagents. Keywords: hypervalent iodine; reagent development; structural analysis; thermal stability; thermogravimetric analysis; Introduction Hypervalent iodine(III) reagents have experienced a renaissance in
  • vital to gain a fundamental understanding of the structural factors affecting their stability and reactivity. Previous reports have suggested a link between structural factors and thermal stability of hypervalent iodine compounds [10][11][12][13][14][15][16]. Iodine(III) compounds are generally trigonal
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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

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  • aryl groups attached to an iodine atom and an associated "anion". X-ray studies revealed that these iodine(III) compounds typically have a T-type structure 1 (Figure 1). In solution, they dissociate into Ar2I+ and X− counterions 2, with the degree of dissociation influenced by the solvent and the
  • compounds (Scheme 16) [68]. The novel iodine(III) intermediate was generated through nucleophilic substitution of a heteroatom nucleophile, which initiated the reaction. A subsequent aryl migration from the iodine to the heteroatom resulted in the formation of the arylated nucleophile. In addition to
  • (Scheme 17) suggests that the reaction initiates with an SNAr at the ortho-carbon, forming a Meisenheimer complex I and a novel iodine(III) intermediate II. This type of reactivity is unprecedented, as past reactions between nucleophiles and diaryliodonium salts usually lead to a reduction of iodine(III
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Published 13 Nov 2024

Hypervalent iodine-mediated cyclization of bishomoallylamides to prolinols

  • Smaher E. Butt,
  • Konrad Kepski,
  • Jean-Marc Sotiropoulos and
  • Wesley J. Moran

Beilstein J. Org. Chem. 2024, 20, 2455–2460, doi:10.3762/bjoc.20.209

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  • 2019, we reported our DFT study on the cyclization of N-allylbenzamide (1a) to the 2-oxazoline 4a, i.e., where n = 1 and Ar = Ph [18]. This work indicated that the alkene is activated by the iodine(III) species and that this triggers cyclization. Intrigued by the change in mechanism from O- to N
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Published 30 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

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  • applied as catalyst for the cyclization of propargylic amide 11, a typical benchmark reaction in gold catalysis (Scheme 2) [24][25][26][27], which had previously already been activated by iodine(I) and iodine(III)-based XB donors [15][18]. To evaluate the activity of the new iodoloisoxazolium 7BArF, it
  • was compared to the four monodentate iodine(III)-based XB donors 1BArF–4BArF (Scheme 2), which had been applied in a previous study by our group as triflate salts and which had shown strong differences in XB donor strength [13]. While the six-membered iodininium salt 3OTf proved to be markedly weaker
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Published 23 Sep 2024

Hydrogen-bond activation enables aziridination of unactivated olefins with simple iminoiodinanes

  • Phong Thai,
  • Lauv Patel,
  • Diyasha Manna and
  • David C. Powers

Beilstein J. Org. Chem. 2024, 20, 2305–2312, doi:10.3762/bjoc.20.197

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  • the combination of synthetically tunable iodine-centered electrophilicity and the diversity of substrate functionalization mechanisms that can be accessed [1][2]. Large families of iodine(III)- and iodine(V)-based reagents have been developed – including iodobenzene diacetate (PhI(OAc)2, PIDA
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Published 11 Sep 2024

Solvent-dependent chemoselective synthesis of different isoquinolinones mediated by the hypervalent iodine(III) reagent PISA

  • Ze-Nan Hu,
  • Yan-Hui Wang,
  • Jia-Bing Wu,
  • Ze Chen,
  • Dou Hong and
  • Chi Zhang

Beilstein J. Org. Chem. 2024, 20, 1914–1921, doi:10.3762/bjoc.20.167

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  • isoquinolinone derivatives. The method provides highly chemoselective access to 3- or 4-substituted isoquinolinone derivatives by reacting o-alkenylbenzamide derivatives with PISA in either acetonitrile or wet hexafluoro-2-isopropanol. Keywords: annulation; C–H amination; hypervalent iodine reagent; iodine(III
  • the substrate, and thus preventing the possible interaction between the amide moiety and PISA, as opposed to CH3CN. The olefin moiety of the complex then interacts with the exposed central iodine(III) atom in PISA [25], forming the intermediate D. Similar cyclic iodonium intermediates were also
  • hexafluoro-2-propanol led to 3-substituted isoquinolinones. The solvent-dependent chemoselective synthesis of isoquinolinone derivatives is interesting and unprecedented. Further research on synthetic utility of PISA, a unique zwitterionic hypervalent iodine(III) reagent, is underway in our laboratory
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Published 07 Aug 2024

Oxidative fluorination with Selectfluor: A convenient procedure for preparing hypervalent iodine(V) fluorides

  • Samuel M. G. Dearman,
  • Xiang Li,
  • Yang Li,
  • Kuldip Singh and
  • Alison M. Stuart

Beilstein J. Org. Chem. 2024, 20, 1785–1793, doi:10.3762/bjoc.20.157

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  • -molecule drugs contain at least one fluorine atom [2]. Hypervalent iodine(III) fluorides, such as difluoroiodotoluene 1 and fluoroiodane 2, have been key to the development of numerous, new synthetic procedures for C–F bond formation over the last decade. Since difluoroiodotoluene 1 has low chemical
  • as Selectfluor (Scheme 1B) [12][13][14][15][16][17][18][19][20]. In contrast to the chemistry of hypervalent iodine(III) reagents, very little is known about hypervalent iodine(V) fluorides. One problem that has blocked research into these compounds has been the lack of synthetic procedures to access
  • ] reacted a perfluorinated iodine(III) compound with XeF2 and postulated the formation of a (perfluoroalkyl)iodine(V) difluoride intermediate which underwent a reductive elimination to afford perfluorinated products (Scheme 2C). In 2019 Togni reported a safer route to a range of acyclic iodine(V) fluorides
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Published 29 Jul 2024

Oxidation of benzylic alcohols to carbonyls using N-heterocyclic stabilized λ3-iodanes

  • Thomas J. Kuczmera,
  • Pim Puylaert and
  • Boris J. Nachtsheim

Beilstein J. Org. Chem. 2024, 20, 1677–1683, doi:10.3762/bjoc.20.149

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  • with common iodine(III) reagents by 1H NMR spectroscopy (Figure 4). After 60 h the measurements revealed a higher yield of aldehyde 4a using 1a (68%) compared to 1c (30%) under the influence of AlCl3. As a comparison, the use of PIDA (5b) and IBA (5c) with the additive resulted in a significantly lower
  • NHI 1c (10.0 µmol) and alcohol (2 or 3a, 10.0 µmol) were dissolved in CD3CN (600 µL) and 1H NMR spectra were recorded. Oxidation of 3a to 4a using different iodine(III) reagents with AlCl3 as an additive. Conditions: The turnover of an equimolar mixture of 3a, iodine(III), and AlCl3 (10.0 µmol
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Published 19 Jul 2024

Divergent role of PIDA and PIFA in the AlX3 (X = Cl, Br) halogenation of 2-naphthol: a mechanistic study

  • Kevin A. Juárez-Ornelas,
  • Manuel Solís-Hernández,
  • Pedro Navarro-Santos,
  • J. Oscar C. Jiménez-Halla and
  • César R. Solorio-Alvarado

Beilstein J. Org. Chem. 2024, 20, 1580–1589, doi:10.3762/bjoc.20.141

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  • halogenation via PhIX2. Keywords: aromatic bromination; aromatic chlorination; density functional theory (DFT); hypervalent iodine; iodine(III); Introduction Hypervalent iodine(III) reagents have gained attention as strong oxidants with a low toxicity [1][2][3][4][5][6][7][8] and due to the ability to mimic
  • reactivity [9] usually associated with transition metals [10][11]. Iodine(III) compounds have been used for the formation of different bond types, such as C–C [12][13], C–O [14][15], C–N [16], C–S [17], C–CN [18], C–F [19][20][21], C–I [22][23], C–NO2 [24][25] and, in the context of this work, C–X (X = Cl
  • , Br) [26][27][28][29][30][31]. So far, different protocols for the halogenation of arenes using iodine(III) reagents have been described, mainly using (diacetoxyiodo)benzene (PIDA)/TMSCl, PIDA/TMSBr [32], and [bis(trifluoroacetoxy)iodo]benzene (PIFA)/TMSBr [33]. We have recently developed a new
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Published 15 Jul 2024

Predicting bond dissociation energies of cyclic hypervalent halogen reagents using DFT calculations and graph attention network model

  • Yingbo Shao,
  • Zhiyuan Ren,
  • Zhihui Han,
  • Li Chen,
  • Yao Li and
  • Xiao-Song Xue

Beilstein J. Org. Chem. 2024, 20, 1444–1452, doi:10.3762/bjoc.20.127

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  • , University of Chinese Academy of Sciences, Shanghai 200032, P. R. China, School of Chemistry and Material Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, P. R. China 10.3762/bjoc.20.127 Abstract Although hypervalent iodine(III) reagents have
  • hypervalent iodine(III) reagents has been developed [12][13][14][15][16][17] (Figure 1), including the well-known Zhdankin reagents [13] and Togni reagents [14]. These reagents are popularly used as electrophilic group transfer reagents [18][19] in a variety of reactions, such as C–H functionalization [20][21
  • ][22], unsaturated alkane addition [23][24], and cyclization [25][26]. Despite the rapid development of hypervalent iodine(III) reagents, the exploration of isoelectronic hypervalent bromine(III) and chlorine(III) reagents has been comparatively limited despite their demonstrated potential for unique
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Published 28 Jun 2024

Hypervalent iodine-catalyzed amide and alkene coupling enabled by lithium salt activation

  • Akanksha Chhikara,
  • Fan Wu,
  • Navdeep Kaur,
  • Prabagar Baskaran,
  • Alex M. Nguyen,
  • Zhichang Yin,
  • Anthony H. Pham and
  • Wei Li

Beilstein J. Org. Chem. 2024, 20, 1405–1411, doi:10.3762/bjoc.20.122

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  • ; lithium salt activation; olefin oxyamination; oxazoline; Introduction Hypervalent iodine(III) reagents, also known as λ3–iodanes, have been well established and used in organic synthesis for the past decades [1][2][3][4][5]. The pioneering works of Fuchigami and Fugita, Ochiai, Kita, and later the
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Published 24 Jun 2024

Oxidative hydrolysis of aliphatic bromoalkenes: scope study and reactivity insights

  • Amol P. Jadhav and
  • Claude Y. Legault

Beilstein J. Org. Chem. 2024, 20, 1286–1291, doi:10.3762/bjoc.20.111

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  • gained popularity due to their commercial availability [1][2][3][4][5] and versatility for phenolic dearomatizations, oxidative annulations, fragmentations, and oxidative rearrangements [6][7][8][9][10][11]. In particular, iodine(III) reagents have been proven effective for a wide range of oxidative
  • transformations, cementing their position as a go-to option for organic chemists. Based on our continued interest in iodine(III)-mediated chemistry, we have explored numerous strategies in oxidative transformations such as direct α-tosyloxylation of ketones [12][13][14], and the oxidation of enol esters [15][16
  • ). We then explored catalytic conditions for the generation of the iodine(III) reagent. Remarkably, when catalytic PhI (0.2 equiv) was employed for in situ generation of Koser’s reagent by using m-CPBA (1.2 equiv) as an oxidant, almost similar results were obtained (Table 2, entry 1) with those obtained
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Published 03 Jun 2024

Auxiliary strategy for the general and practical synthesis of diaryliodonium(III) salts with diverse organocarboxylate counterions

  • Naoki Miyamoto,
  • Daichi Koseki,
  • Kohei Sumida,
  • Elghareeb E. Elboray,
  • Naoko Takenaga,
  • Ravi Kumar and
  • Toshifumi Dohi

Beilstein J. Org. Chem. 2024, 20, 1020–1028, doi:10.3762/bjoc.20.90

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  • wide range of substituents on (hetero)aryl iodine(III) compounds, including electron-rich, electron-poor, sterically congested, and acid-labile groups, as well as a broad range of aliphatic and aromatic carboxylic acids for the synthesis of diverse aryl(TMP)iodonium(III) carboxylates in high yields
  • trifluoroacetic acid, followed by coupling with 1,3,5-trimethoxybenzene [18] (Scheme 1A). This process demonstrated tolerance for a wide range of electron-rich and electron-deficient (hetero)aryl iodine(III) compounds. Wirth and colleagues reported the flow synthesis of diaryliodonium(III) trifluoroacetates using
  • (TFE, Scheme 2B) [21]. Our group previously reported the synthesis of diaryliodonium(III) salts by combining hypervalent iodine(III) reagents with electron-rich arenes in fluoroalcohol solvents, such as TFE or 1,1,1,3,3,3-hexafluoro-2-propanol [21][22]. These solvents stabilize the cationic
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Published 03 May 2024

Three-component N-alkenylation of azoles with alkynes and iodine(III) electrophile: synthesis of multisubstituted N-vinylazoles

  • Jun Kikuchi,
  • Roi Nakajima and
  • Naohiko Yoshikai

Beilstein J. Org. Chem. 2024, 20, 891–897, doi:10.3762/bjoc.20.79

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  • Jun Kikuchi Roi Nakajima Naohiko Yoshikai Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan 10.3762/bjoc.20.79 Abstract A stereoselective N-alkenylation of azoles with alkynes and iodine(III) electrophile is reported. The reaction
  • reaction of azoles with alkynes and iodine(III) electrophile, benziodoxole triflate (BXT, 1; Scheme 1c). Displaying exclusive trans-selectivity, the reaction tolerates a broad range of azoles, including pyrazole, 1,2,3-triazole, tetrazole, indazole, and benzotriazole, with internal alkynes as coupling
  • preparation of hitherto inaccessible types of densely functionalized vinylazoles with tetrasubstituted olefinic moiety. Results and Discussion Our group has demonstrated benziodoxole triflate (BXT) [26] and related compounds as a versatile iodine(III) electrophile for the inter- and intramolecular
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Published 22 Apr 2024

Combining the best of both worlds: radical-based divergent total synthesis

  • Kyriaki Gennaiou,
  • Antonios Kelesidis,
  • Maria Kourgiantaki and
  • Alexandros L. Zografos

Beilstein J. Org. Chem. 2023, 19, 1–26, doi:10.3762/bjoc.19.1

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  • reported the flow-controlled divergent synthesis of aporphine and morphinandienone alkaloids based on biomimetic common scaffolds (e.g., 180) using hypervalent iodine(III) reagents. Capitalizing on previously reported mechanistic investigations, they assumed that 180 can rearrange to glaucine (183) through
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Published 02 Jan 2023

Redox-active molecules as organocatalysts for selective oxidative transformations – an unperceived organocatalysis field

  • Elena R. Lopat’eva,
  • Igor B. Krylov,
  • Dmitry A. Lapshin and
  • Alexander O. Terent’ev

Beilstein J. Org. Chem. 2022, 18, 1672–1695, doi:10.3762/bjoc.18.179

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  • the key factor for the high chemoselectivity. Hypervalent iodine catalysis Effective hypervalent iodine(III)-catalyzed processes (for example, oxidative double C=C bond functionalization, oxidative cyclizations, CH-functionalization of carbonyl compounds, etc.) employing mainly peroxoacids or electric
  • current as terminal oxidants were developed [139][140][141][142][143][144][145]. The key step in the catalytic cycle involving aryl iodides is the formation of iodine(III) species. Enantioselective oxidative processes mediated by chiral hypervalent iodine compounds were reviewed recently [146]. In the
  • configuration of the final product. A fundamentally different mechanism distinguishes the 1,2-diiodo-4,5-dimethoxybenzene catalyst from other aryl iodides. In contrast to the standard mechanism, in which iodine(III) is an active intermediate species, in the case of 1,2-diiodo-4,5-dimethoxybenzene, the iodine
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Published 09 Dec 2022

Menadione: a platform and a target to valuable compounds synthesis

  • Acácio S. de Souza,
  • Ruan Carlos B. Ribeiro,
  • Dora C. S. Costa,
  • Fernanda P. Pauli,
  • David R. Pinho,
  • Matheus G. de Moraes,
  • Fernando de C. da Silva,
  • Luana da S. M. Forezi and
  • Vitor F. Ferreira

Beilstein J. Org. Chem. 2022, 18, 381–419, doi:10.3762/bjoc.18.43

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  • published an alternative and sustainable methodology, using phenyliodine(III) bis(trifluoroacetate) (PIFA) as an oxidizing agent of the demethylation reaction [86]. The hypervalent iodine(III) proved to be a good oxidizing agent in the formation of 10 (92% yield) (Table 3, entry 2). According to the authors
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Published 11 Apr 2022

An improved, scalable synthesis of Notum inhibitor LP-922056 using 1-chloro-1,2-benziodoxol-3-one as a superior electrophilic chlorinating agent

  • Nicky J. Willis,
  • Elliott D. Bayle,
  • George Papageorgiou,
  • David Steadman,
  • Benjamin N. Atkinson,
  • William Mahy and
  • Paul V. Fish

Beilstein J. Org. Chem. 2019, 15, 2790–2797, doi:10.3762/bjoc.15.271

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  • et al. described the electrophilic chlorination of arenes and heterocycles by 1-chloro-1,2-benziodoxol-3-one (12) [18][19]. The hypervalent iodine(III) reagent 12 is reported to be a mild and effective reagent for the chlorination of nitrogen containing heterocycles which is easy to prepare and is
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Published 19 Nov 2019

Thermal stability of N-heterocycle-stabilized iodanes – a systematic investigation

  • Andreas Boelke,
  • Yulia A. Vlasenko,
  • Mekhman S. Yusubov,
  • Boris J. Nachtsheim and
  • Pavel S. Postnikov

Beilstein J. Org. Chem. 2019, 15, 2311–2318, doi:10.3762/bjoc.15.223

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  • )cyclic iodanes. Albeit aryl-λ3-iodanes are viewed as safe and stable under ambient temperatures, systematic thermal degradation studies of hypervalent iodine reagents are still rare. In 1992 Varvoglis and co-workers investigated the thermal degradation of a variety of aryl iodine(III) dicarboxylates into
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Published 27 Sep 2019

Recent advances in transition-metal-catalyzed incorporation of fluorine-containing groups

  • Xiaowei Li,
  • Xiaolin Shi,
  • Xiangqian Li and
  • Dayong Shi

Beilstein J. Org. Chem. 2019, 15, 2213–2270, doi:10.3762/bjoc.15.218

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  • ] presented the nucleophilic fluorination of diaryliodonium salts with KF through a Cu(I/III) catalytic cycle mechanism. This procedure preferentially fluorinates the smaller aromatic ligand on iodine(III). Also, the addition of Cu(OTf)2 and 18-crown-6 promoted the fluorination effectively. Finally, excellent
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Published 23 Sep 2019

Mechanochemistry of supramolecules

  • Anima Bose and
  • Prasenjit Mal

Beilstein J. Org. Chem. 2019, 15, 881–900, doi:10.3762/bjoc.15.86

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  • exothermic reactions between amines and iodine(III) [114]. By this process undirected C(sp3)–H bonds were shown to be functionalized for dehydrogenative imination reactions. Overall, at 1,5-distances (remote) a dehydrogenative and intramolecular C(sp3)–H imination by 4H elimination was readily done via
  • the iodine(III) environment. Conclusion Over the last years, substantial progress has been made in the area of mechanochemistry as environmentally benign method in organic synthesis, materials science and supramolecular chemistry. In this review the major focus has been to cover the concept and
  • (pyridin-4-yl)ethylene and 4,6-dichlororesorcinol. Halogen-bonded co-crystals via a) I···P, b) I···As, and c) I···Sb bonds [112]. Transformation of contact-explosive primary amines and iodine(III) into a successful chemical reaction for amide synthesis. Undirected C–H functionalization by using the acidic
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Published 12 Apr 2019
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