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Search for "catalyst-free" in Full Text gives 81 result(s) in Beilstein Journal of Organic Chemistry.

Direct C(sp3)–H allylation of 2-alkylpyridines with Morita–Baylis–Hillman carbonates via a tandem nucleophilic substitution/aza-Cope rearrangement

  • Siyu Wang,
  • Lianyou Zheng,
  • Shutao Wang,
  • Shulin Ning,
  • Zhuoqi Zhang and
  • Jinbao Xiang

Beilstein J. Org. Chem. 2021, 17, 2505–2510, doi:10.3762/bjoc.17.167

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  • Siyu Wang Lianyou Zheng Shutao Wang Shulin Ning Zhuoqi Zhang Jinbao Xiang The Center for Combinatorial Chemistry and Drug Discovery, School of Pharmaceutical Sciences, Jilin University, 1266 Fujin Road, Changchun, Jilin 130021, P. R. China 10.3762/bjoc.17.167 Abstract A base- and catalyst-free C
  • in the reaction to give the allylation products in 26–91% yields. The developed method provides a straightforward and operational simple strategy for the allylic functionalization of 2-alkypyridine derivatives. Keywords: 2-alkylpyridines; allylic alkylation; aza-Cope rearrangement; catalyst-free
  • our studies on a direct benzylic allylic reaction of 2-alkylpyridines with MBH carbonates as allylic precursors under base- and catalyst-free conditions. As depicted in Scheme 2, we envisioned that the MBH carbonate 2 can undergo the SN2’ reaction with the nucleophilic 2-picoline 1a, giving the
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Published 01 Oct 2021

A novel methodology for the efficient synthesis of 3-monohalooxindoles by acidolysis of 3-phosphate-substituted oxindoles with haloid acids

  • Li Liu,
  • Yue Li,
  • Tiao Huang,
  • Dulin Kong and
  • Mingshu Wu

Beilstein J. Org. Chem. 2021, 17, 2321–2328, doi:10.3762/bjoc.17.150

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  • disclosed the application of N-fluorobenzenesulfonimide (NFSI) and NBS (N-bromosuccinimide), respectively, as the halogen sources, with diazoacetamide under catalyst-free conditions via a carbene pathway, which constructed 3-fluorooxindoles and 3-bromooxindoles (Scheme 1, reaction 1) [20][21]. Then, the
  • ) under solvent-free and catalyst-free conditions at room temperature (Table 1, entry 1). To our delight, the desired product 3a was obtained in 19% yield. To further improve the yield, we firstly probed the solvent effect using methanol, THF, toluene, ClCH2CH2Cl, 1,4-dioxane, chloroform, dichloromethane
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Published 07 Sep 2021

An initiator- and catalyst-free hydrogel coating process for 3D printed medical-grade poly(ε-caprolactone)

  • Jochen Löblein,
  • Thomas Lorson,
  • Miriam Komma,
  • Tobias Kielholz,
  • Maike Windbergs,
  • Paul D. Dalton and
  • Robert Luxenhofer

Beilstein J. Org. Chem. 2021, 17, 2095–2101, doi:10.3762/bjoc.17.136

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  • fouling, critically depend mainly on the immediate surface energy. To gain control over the surface chemistry post-processing modifications are generally necessary, since it′s not a feature of additive manufacturing. Here, we report on the use of initiator and catalyst-free photografting and
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Published 19 Aug 2021

A recent overview on the synthesis of 1,4,5-trisubstituted 1,2,3-triazoles

  • Pezhman Shiri,
  • Ali Mohammad Amani and
  • Thomas Mayer-Gall

Beilstein J. Org. Chem. 2021, 17, 1600–1628, doi:10.3762/bjoc.17.114

Graphical Abstract
  • catalyst-free conditions. A series of azidobenzenesulfonamides 101 was first synthesized from commercially available orthanilic acid by a three-step procedure and then submitted to cycloaddition with different alkynes 102 using CuI and Cu as copper source, tris([1-(tert-butyl)-1H-1,2,3-triazol-4-yl]methyl
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Published 13 Jul 2021

Microwave-assisted multicomponent reactions in heterocyclic chemistry and mechanistic aspects

  • Shivani Gulati,
  • Stephy Elza John and
  • Nagula Shankaraiah

Beilstein J. Org. Chem. 2021, 17, 819–865, doi:10.3762/bjoc.17.71

Graphical Abstract
  • moderate to good yields under catalyst-free conditions (Scheme 1). A rationale of mechanism proposed the transformation via a Knoevenagel condensation between aldehyde and a molecule of 6 affording A. The concurrent condensation of ammonium acetate with another molecule of 6 led to the formation of an
  • co-workers [50] demonstrated an aqueous phase, diastereoselective, multicomponent reaction involving substituted isatins 35, β-nitrostyrene 36 and benzylamine (20) or α-amino acids 37 using microwave irradiation to afford a library of spirooxindoles 38 in good yields under catalyst-free conditions
  • ). Similarly, the same group extended the work by illustrating [51] a three and four-component microwave-assisted base and catalyst-free reaction for the synthesis of substituted spirooxindoles 40. The three-component reaction involved the reaction between substituted isatin 35, but-2-ynedioates 39 and amino
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Published 19 Apr 2021

Synthetic reactions driven by electron-donor–acceptor (EDA) complexes

  • Zhonglie Yang,
  • Yutong Liu,
  • Kun Cao,
  • Xiaobin Zhang,
  • Hezhong Jiang and
  • Jiahong Li

Beilstein J. Org. Chem. 2021, 17, 771–799, doi:10.3762/bjoc.17.67

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  • widespread presence in pharmaceutical-, agrochemical-, and materials sciences [73][74][75]. At present, most of the C–N-bonding reactions require transition-metal catalysis, and the reaction conditions are more stringent; however, the EDA-complex pathway proceeds under mild, catalyst-free conditions
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Published 06 Apr 2021

Synthesis of β-triazolylenones via metal-free desulfonylative alkylation of N-tosyl-1,2,3-triazoles

  • Soumyaranjan Pati,
  • Renata G. Almeida,
  • Eufrânio N. da Silva Júnior and
  • Irishi N. N. Namboothiri

Beilstein J. Org. Chem. 2021, 17, 762–770, doi:10.3762/bjoc.17.66

Graphical Abstract
  • the keto-form [53][54][55][56]. Presumably for this reason, the acyclic 1,3-dicarbonyls did not react in the desired way under our experimental conditions. Conclusion In conclusion, we have developed a metal-free and catalyst-free approach for the desulfonylative coupling of N-tosyl-1,2,3-triazoles
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Published 31 Mar 2021

Effective microwave-assisted approach to 1,2,3-triazolobenzodiazepinones via tandem Ugi reaction/catalyst-free intramolecular azide–alkyne cycloaddition

  • Maryna O. Mazur,
  • Oleksii S. Zhelavskyi,
  • Eugene M. Zviagin,
  • Svitlana V. Shishkina,
  • Vladimir I. Musatov,
  • Maksim A. Kolosov,
  • Elena H. Shvets,
  • Anna Yu. Andryushchenko and
  • Valentyn A. Chebanov

Beilstein J. Org. Chem. 2021, 17, 678–687, doi:10.3762/bjoc.17.57

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  • Chemistry, University of Nebraska – Lincoln, 639 N 12th St, Lincoln, NE 68588, USA 10.3762/bjoc.17.57 Abstract A novel catalyst-free synthetic approach to 1,2,3-triazolobenzodiazepinones has been developed and optimized. The Ugi reaction of 2-azidobenzaldehyde, various amines, isocyanides, and acids
  • harder while the microwave-assisted catalyst-free conditions were effective for both terminal and non-terminal alkynes. Keywords: click chemistry; microwave chemistry; multicomponent reactions; triazolobenzodiazepines; Ugi reaction; Introduction Benzannulated heterocycles are among the most important
  • availability of previously described methods for the synthesis of 1,2,3-triazolobenzodiazepines represented in Scheme 1, they have such drawbacks as long reaction time, use of toxic solvents, additional catalysts, etc. In this article, we present a novel tandem Ugi/catalyst-free intramolecular azide–alkyne
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Published 08 Mar 2021

Decarboxylative trifluoromethylthiolation of pyridylacetates

  • Ryouta Kawanishi,
  • Kosuke Nakada and
  • Kazutaka Shibatomi

Beilstein J. Org. Chem. 2021, 17, 229–233, doi:10.3762/bjoc.17.23

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  • lithium pyridylacetates undergo decarboxylative fluorination upon treatment with an electrophilic fluorination reagent to afford fluoromethylpyridines under catalyst-free conditions. Furthermore, we demonstrated the one-pot synthesis of fluoromethylpyridines from methyl pyridylacetates by saponification
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Published 25 Jan 2021

An atom-economical addition of methyl azaarenes with aromatic aldehydes via benzylic C(sp3)–H bond functionalization under solvent- and catalyst-free conditions

  • Divya Rohini Yennamaneni,
  • Vasu Amrutham,
  • Krishna Sai Gajula,
  • Rammurthy Banothu,
  • Murali Boosa and
  • Narender Nama

Beilstein J. Org. Chem. 2020, 16, 3093–3103, doi:10.3762/bjoc.16.259

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  • malononitrile under catalyst-free conditions have been reported [29]. Wang et al. reported the functionalization of benzylic C–H bonds of 2-methylazaarenes by nucleophilic addition to aromatic aldehydes catalyzed by acetic acid using harmful chlorinated solvent, and this reaction suffers from longer reaction
  • [41][42]. However, to develop advantageous eco-friendly, atom-economical, simple, and efficient synthetic-organic processes under solvent- and catalyst-free conditions in order to synthesize highly demanding pharmaceuticals or natural products can be quite backbreaking [43][44][45]. From this
  • perspective, we herein disclose environmentally benign, atom-economical, catalyst-free nucleophilic additions of benzylic-like azaarene C–H groups to various benzaldehydes under neat conditions (Scheme 3). Results and Discussion With the purpose to develop an environmentally benign process, we first examined
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Published 23 Dec 2020

Thermodynamic and electrochemical study of tailor-made crown ethers for redox-switchable (pseudo)rotaxanes

  • Henrik Hupatz,
  • Marius Gaedke,
  • Hendrik V. Schröder,
  • Julia Beerhues,
  • Arto Valkonen,
  • Fabian Klautzsch,
  • Sebastian Müller,
  • Felix Witte,
  • Kari Rissanen,
  • Biprajit Sarkar and
  • Christoph A. Schalley

Beilstein J. Org. Chem. 2020, 16, 2576–2588, doi:10.3762/bjoc.16.209

Graphical Abstract
  • the optoelectronic properties of the NDI unit. The binding properties suggest that the combination of the A1·BArF24 axle and NDIC8 is optimal for the synthesis of an NDI-containing [2]rotaxane. We applied Takata’s catalyst-free stoppering approach [58] using the nitrile oxide St for the preparation of
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Published 20 Oct 2020

Et3N/DMSO-supported one-pot synthesis of highly fluorescent β-carboline-linked benzothiophenones via sulfur insertion and estimation of the photophysical properties

  • Dharmender Singh,
  • Vipin Kumar and
  • Virender Singh

Beilstein J. Org. Chem. 2020, 16, 1740–1753, doi:10.3762/bjoc.16.146

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  • -metal-free strategy is presented to access novel β-carboline-tethered benzothiophenone derivatives from 1(3)-formyl-β-carbolines using elemental sulfur activated by Et3N/DMSO. This expeditious catalyst-free reaction proceeds through the formation of β-carboline-based 2-nitrochalcones followed by an
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Published 20 Jul 2020

Microwave-assisted efficient one-pot synthesis of N2-(tetrazol-5-yl)-6-aryl/heteroaryl-5,6-dihydro-1,3,5-triazine-2,4-diamines

  • Moustafa Sherief Moustafa,
  • Ramadan Ahmed Mekheimer,
  • Saleh Mohammed Al-Mousawi,
  • Mohamed Abd-Elmonem,
  • Hesham El-Zorba,
  • Afaf Mohamed Abdel Hameed,
  • Tahany Mahmoud Mohamed and
  • Kamal Usef Sadek

Beilstein J. Org. Chem. 2020, 16, 1706–1712, doi:10.3762/bjoc.16.142

Graphical Abstract
  • experimental conditions and the results revealed that performing the reaction in dioxane, CH3CN, THF, or catalyst-free ethanol resulted in no product formation. However, the same products were obtained with lower yields (≈60%) when performing the reaction under conventional heating utilizing pyridine as the
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Published 16 Jul 2020

One-pot synthesis of 1,3,5-triazine-2,4-dithione derivatives via three-component reactions

  • Gui-Feng Kang and
  • Gang Zhang

Beilstein J. Org. Chem. 2020, 16, 1447–1455, doi:10.3762/bjoc.16.120

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  • 100050, China 10.3762/bjoc.16.120 Abstract A catalyst-free one-pot synthetic methodology was developed for the preparation of 1,3,5-triazine-2,4-dithione derivatives through three-component reactions of arylaldehydes, thiourea, and orthoformates. The procedure tolerated a diverse range of arylaldehydes
  • alkylation process [39]. Finally, proton transfer processes afford the desired product 6 and byproduct 5. Conclusion In summary, we have developed a simple and efficient method for the synthesis of 4-aryl-6-(alkylthio)-3,4-dihydro-1,3,5-triazine-2(1H)-thiones through a catalyst-free multicomponent reaction
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Published 24 Jun 2020

Architecture and synthesis of P,N-heterocyclic phosphine ligands

  • Wisdom A. Munzeiwa,
  • Bernard Omondi and
  • Vincent O. Nyamori

Beilstein J. Org. Chem. 2020, 16, 362–383, doi:10.3762/bjoc.16.35

Graphical Abstract
  • yields starting from the corresponding N-vinylpyrroles 103 and 104 (Scheme 19). The N-isopropenylpyrrole precursor 104 gave the adducts with 100% regioselectivity. More recently a solvent and catalyst-free method has been reported for vinylpyridines [97]. Preparation of N-heterocyclic phosphines via P–N
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Published 12 Mar 2020

Microwave-assisted synthesis of 2-substituted 4,5,6,7-tetrahydro-1,3-thiazepines from 4-aminobutanol

  • María C. Mollo,
  • Natalia B. Kilimciler,
  • Juan A. Bisceglia and
  • Liliana R. Orelli

Beilstein J. Org. Chem. 2020, 16, 32–38, doi:10.3762/bjoc.16.5

Graphical Abstract
  • catalyst free. The scope of the method includes the synthesis of unprecedented examples of 2-alkyl, aralkyl and alkenyl derivatives. Chemical shift data for N-thiobenzoylpiperidine and compound 4a. PPSE promoted ring closure reactions of amido- and thioamido alcohols. Synthesis of compounds 3. Synthesis of
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Published 06 Jan 2020

Why do thioureas and squaramides slow down the Ireland–Claisen rearrangement?

  • Dominika Krištofíková,
  • Juraj Filo,
  • Mária Mečiarová and
  • Radovan Šebesta

Beilstein J. Org. Chem. 2019, 15, 2948–2957, doi:10.3762/bjoc.15.290

Graphical Abstract
  • rearrangements. Furthermore, these organocatalysts slowed down the Ireland–Claisen rearrangement in comparison to an uncatalyzed reaction. The catalyst-free reaction proceeded well in green solvents or without any solvent. DFT calculations showed that the activation barriers are higher for reactions involving
  • hand, catalyst-free Ireland–Claisen rearrangements proceed well in green solvents such as CpOMe or under solvent-free conditions. NMR kinetic measurements supported the notion that thiourea and squaramide organocatalysts bind strongly to the starting silyl ketene acetals and prevent the Ireland–Claisen
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Published 10 Dec 2019

Facile regiodivergent synthesis of spiro pyrrole-substituted pseudothiohydantoins and thiohydantoins via reaction of [e]-fused 1H-pyrrole-2,3-diones with thiourea

  • Aleksandr I. Kobelev,
  • Nikita A. Tretyakov,
  • Ekaterina E. Stepanova,
  • Maksim V. Dmitriev,
  • Michael Rubin and
  • Andrey N. Maslivets

Beilstein J. Org. Chem. 2019, 15, 2864–2871, doi:10.3762/bjoc.15.280

Graphical Abstract
  • pyrrole-2-one fragment involving the reaction of [e]-fused 1H-pyrrole-2,3-diones with thioureas was developed. The obtained spiro pseudothiohydantoin derivatives were found to undergo a pseudothiohydantoin–thiohydantoin rearrangement. The reactions were shown to proceed under catalyst-free conditions in
  • pseudothiohydantoin–thiohydantoin rearrangement. Therein, the substituents of the thiourea moiety were found to be crucial for tuning the conditions of this rearrangement. Notably, the reactions proceeded under catalyst-free conditions with good yields. Hydantoin-based commercially available drugs. Electrophilic
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Published 27 Nov 2019

In water multicomponent synthesis of low-molecular-mass 4,7-dihydrotetrazolo[1,5-a]pyrimidines

  • Irina G. Tkachenko,
  • Sergey A. Komykhov,
  • Vladimir I. Musatov,
  • Svitlana V. Shishkina,
  • Viktoriya V. Dyakonenko,
  • Vladimir N. Shvets,
  • Mikhail V. Diachkov,
  • Valentyn A. Chebanov and
  • Sergey M. Desenko

Beilstein J. Org. Chem. 2019, 15, 2390–2397, doi:10.3762/bjoc.15.231

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  • -mass 4,7-dihydrotetrazolo[1,5-a]pyrimidines. The use of acetoacetic ester derivatives as 1,3-dicarbonyl compounds in the reaction showed high selectivity under catalyst-free conditions, whereas in the case of acetylacetone the formation of a side product was observed. The desired product could be
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Published 08 Oct 2019

Synthesis of ([1,2,4]triazolo[4,3-a]pyridin-3-ylmethyl)phosphonates and their benzo derivatives via 5-exo-dig cyclization

  • Aleksandr S. Krylov,
  • Artem A. Petrosian,
  • Julia L. Piterskaya,
  • Nataly I. Svintsitskaya and
  • Albina V. Dogadina

Beilstein J. Org. Chem. 2019, 15, 1563–1568, doi:10.3762/bjoc.15.159

Graphical Abstract
  • ). Conclusion In conclusion, a series of new 3-methylphosphonylated [1,2,4]triazolo[4,3-a]pyridines, [1,2,4]triazolo[3,4-a]isoquinolines and 1-methylphosphonylated [1,2,4]triazolo[4,3-a]quinolines were synthesized through a catalyst-free 5-exo-dig-type cyclization of chloroethynylphosphonates and commercially
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Published 12 Jul 2019

A novel three-component reaction between isocyanides, alcohols or thiols and elemental sulfur: a mild, catalyst-free approach towards O-thiocarbamates and dithiocarbamates

  • András György Németh,
  • György Miklós Keserű and
  • Péter Ábrányi-Balogh

Beilstein J. Org. Chem. 2019, 15, 1523–1533, doi:10.3762/bjoc.15.155

Graphical Abstract
  • been developed between isocyanides, sulfur and alcohols or thiols under mild reaction conditions to afford O-thiocarbamates and dithiocarbamates in moderate to good yields. The one-pot reaction cascade involves the formation of an isothiocyanate intermediate, thus a catalyst-free synthesis of
  • and improved a catalyst-free method for the preparation of isothiocyanates. Results and Discussion The model reaction of 2,6-dimethylphenyl isocyanide (1a), elemental sulfur (S8) and methanol (2a) was employed to screen for the optimal reaction conditions (Table 1). The reactions were followed by TLC
  • , we have developed an efficient, convenient and scalable multicomponent method for the synthesis of O-thiocarbamates and dithiocarbamates under mild reaction conditions. This approach includes an improved catalyst-free synthesis of isothiocyanates from elemental sulfur and isocyanides, and shows good
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Published 10 Jul 2019

Multicomponent reactions (MCRs): a useful access to the synthesis of benzo-fused γ-lactams

  • Edorta Martínez de Marigorta,
  • Jesús M. de Los Santos,
  • Ana M. Ochoa de Retana,
  • Javier Vicario and
  • Francisco Palacios

Beilstein J. Org. Chem. 2019, 15, 1065–1085, doi:10.3762/bjoc.15.104

Graphical Abstract
  • formylbenzoate 29 has also been used in another three-component synthesis along with amines 2 and ketones 31 (Scheme 8) [82]. This Mannich/lactamization reaction achieves good yields for a broad scope of 3-substituted isoindolinones 32, in either catalyst-free conditions or using p-toluenesulfonic acid. Ortho
  • a photoinduced, catalyst-free three-component reaction (Scheme 32) [110]. In this way, a variety of (2-oxoindolin-3-yl)methanesulfonohydrazides 115 with diverse substituents in the aromatic ring and hydrazine nitrogen, were prepared with moderate to good yields. This transformation may be explained
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Published 08 May 2019

Novel (2-amino-4-arylimidazolyl)propanoic acids and pyrrolo[1,2-c]imidazoles via the domino reactions of 2-amino-4-arylimidazoles with carbonyl and methylene active compounds

  • Victoria V. Lipson,
  • Tetiana L. Pavlovska,
  • Nataliya V. Svetlichnaya,
  • Anna A. Poryvai,
  • Nikolay Yu. Gorobets,
  • Erik V. Van der Eycken,
  • Irina S. Konovalova,
  • Svetlana V. Shiskina,
  • Alexander V. Borisov,
  • Vladimir I. Musatov and
  • Alexander V. Mazepa

Beilstein J. Org. Chem. 2019, 15, 1032–1045, doi:10.3762/bjoc.15.101

Graphical Abstract
  • –5 min) and reflux of the equimolar amounts of amines 1, para-substituted benzaldehydes 2, and Meldrum’s acid 3 in 2-propanol led to Knoevenagel–Michael adducts 4a–h (Table 1). Beside the short reaction times and mild conditions, this catalyst-free three-component condensation is characterized by a
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Published 06 May 2019

SO2F2-mediated transformation of 2'-hydroxyacetophenones to benzo-oxetes

  • Revathi Lekkala,
  • Ravindar Lekkala,
  • Balakrishna Moku,
  • K. P. Rakesh and
  • Hua-Li Qin

Beilstein J. Org. Chem. 2019, 15, 976–980, doi:10.3762/bjoc.15.95

Graphical Abstract
  • catalyst-free novel and efficient methodology for the challenging synthesis of benzo-oxetes from 2'-hydroxyacetophenones mediated by sulfuryl fluoride (SO2F2) gas has been realized. The combination of 2'-hydroxyacetophenones and SO2F2 furnishes synthetically challenging benzo-oxetanes in moderate to
  • through a catalyst-free cascade method (Scheme 1c). Results and Discussion Initially, we screened various reaction conditions (see Supporting Information File 1) using 1-(2-hydroxyphenyl)ethanone (1a) as a model substrate. As illustrated in Table 1, the desired product 2a was produced in 50–76% yield when
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Published 25 Apr 2019

Catalyst-free assembly of giant tris(heteroaryl)methanes: synthesis of novel pharmacophoric triads and model sterically crowded tris(heteroaryl/aryl)methyl cation salts

  • Rodrigo Abonia,
  • Luisa F. Gutiérrez,
  • Braulio Insuasty,
  • Jairo Quiroga,
  • Kenneth K. Laali,
  • Chunqing Zhao,
  • Gabriela L. Borosky,
  • Samantha M. Horwitz and
  • Scott D. Bunge

Beilstein J. Org. Chem. 2019, 15, 642–654, doi:10.3762/bjoc.15.60

Graphical Abstract
  • /HPF6 and studied by NMR and by DFT and GIAO-DFT. Keywords: model heteroarylmethylium salts; multicomponent; one-pot catalyst-free assembly; pharmacophoric triads; three-component synthesis; tris(heteroaryl)methanes; Yonemitsu-type reaction; Introduction During the last few decades multicomponent
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Published 12 Mar 2019
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