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  1. Article ; Online: Sustainable Synthesis through Catalyst-Free Photoinduced Cascaded Bond Formation.

    Bhanja, Rosalin / Bera, Shyamal Kanti / Mal, Prasenjit

    Chemistry, an Asian journal

    2024  , Page(s) e202400279

    Abstract: The beginning of photochemical reactions revolutionized synthetic chemistry through sustainable practices. This review explores cutting-edge developments in leveraging light-induced processes for generating cascaded C-C and C-hetero bonds without ... ...

    Abstract The beginning of photochemical reactions revolutionized synthetic chemistry through sustainable practices. This review explores cutting-edge developments in leveraging light-induced processes for generating cascaded C-C and C-hetero bonds without catalysts. Significantly, catalyst-free photoinduced methodologies have garnered considerable attention, especially in the creation of varied heterocyclic frameworks for drug design and the synthesis of natural products. The article delves into underlying mechanisms, addresses limitations, and evaluates various methodologies, emphasizing the potential of photocatalyst and transition metal-free photochemical reactions to enhance sustainability. Divided into two sections, it covers recent strides in C-C and C-heteroatom and multiple C-heteroatom bond formation reactions.
    Language English
    Publishing date 2024-05-08
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2233006-9
    ISSN 1861-471X ; 1861-4728
    ISSN (online) 1861-471X
    ISSN 1861-4728
    DOI 10.1002/asia.202400279
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Regiodivergent C-N Coupling of Quinazolinones Controlled by the Dipole Moments of Tautomers.

    Bera, Shyamal Kanti / Mal, Prasenjit

    Organic letters

    2022  Volume 24, Issue 17, Page(s) 3144–3148

    Abstract: Herein, we report that the dipole moments of tautomers can be the controlling factor for regiodivergent synthesis of either ... ...

    Abstract Herein, we report that the dipole moments of tautomers can be the controlling factor for regiodivergent synthesis of either 14
    MeSH term(s) Isomerism ; Quinazolinones ; Solvents
    Chemical Substances Quinazolinones ; Solvents
    Language English
    Publishing date 2022-04-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1523-7052
    ISSN (online) 1523-7052
    DOI 10.1021/acs.orglett.2c00847
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Regiodivergent C–N Coupling of Quinazolinones Controlled by the Dipole Moments of Tautomers

    Bera, Shyamal Kanti / Mal, Prasenjit

    Organic letters. 2022 Apr. 21, v. 24, no. 17

    2022  

    Abstract: Herein, we report that the dipole moments of tautomers can be the controlling factor for regiodivergent synthesis of either 14H-quinazolino[3,2-f]phenanthridin-14-ones or 6H-quinazolino[1,2-f]phenanthridin-6-ones, selectively, from unmasked 2-([1,1′- ... ...

    Abstract Herein, we report that the dipole moments of tautomers can be the controlling factor for regiodivergent synthesis of either 14H-quinazolino[3,2-f]phenanthridin-14-ones or 6H-quinazolino[1,2-f]phenanthridin-6-ones, selectively, from unmasked 2-([1,1′-biphenyl]-2-yl)quinazolin-4(3H)-one. An intramolecular C(sp²)–NH coupling reaction mediated by PhI(OCOOCF₃)₂ could lead to two different regioisomers selectively at different temperatures when the dielectric constants of solvents like hexafluoroisopropanol and trifluoroacetic acid matched with the tautomer’s dipole moments.
    Keywords acids ; couplings ; dielectric properties ; positional isomers ; solvents ; tautomers ; temperature
    Language English
    Dates of publication 2022-0421
    Size p. 3144-3148.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1523-7052
    DOI 10.1021/acs.orglett.2c00847
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Regioselective synthesis of phenanthridine-fused quinazolinones using a 9-mesityl-10-methylacridinium perchlorate photocatalyst.

    Bhanja, Rosalin / Bera, Shyamal Kanti / Mal, Prasenjit

    Chemical communications (Cambridge, England)

    2023  Volume 59, Issue 30, Page(s) 4455–4458

    Abstract: Herein, we demonstrate a regioselective intramolecular C-N cross-coupling for the synthesis of ... ...

    Abstract Herein, we demonstrate a regioselective intramolecular C-N cross-coupling for the synthesis of 14
    Language English
    Publishing date 2023-04-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/d3cc00537b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Photocatalyst- and Transition Metal-Free Light-Induced Borylation Reactions.

    Bhanja, Rosalin / Bera, Shyamal Kanti / Mal, Prasenjit

    Chemistry, an Asian journal

    2023  Volume 18, Issue 21, Page(s) e202300691

    Abstract: The increasing global warming concerns have propelled a surge in the demand for sustainable energy sources within the domain of synthetic organic chemistry. A particularly prominent area of research has been the development of mild synthetic strategies ... ...

    Abstract The increasing global warming concerns have propelled a surge in the demand for sustainable energy sources within the domain of synthetic organic chemistry. A particularly prominent area of research has been the development of mild synthetic strategies for generating heterocyclic compounds. Heterocyclic compounds containing boron have notably risen to prominence as pivotal reagents in a myriad of organic transformations, showcasing their wide-ranging applicability. This comprehensive review is aimed at collecting the literature pertaining to borylation reactions induced by light, specifically focusing on photocatalyst-free and transition metal-free methodologies. The central emphasis is on delving into selective mechanistic investigations. The amalgamation and analysis of these research insights elucidate the substantial potential inherent in eco-friendly approaches for synthesizing heterocyclic compounds, thus propelling the landscape of sustainable organic chemistry.
    Language English
    Publishing date 2023-10-11
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 2233006-9
    ISSN 1861-471X ; 1861-4728
    ISSN (online) 1861-471X
    ISSN 1861-4728
    DOI 10.1002/asia.202300691
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Transition-Metal- and Photocatalyst-Free Photoinduced Formation of Carbon–Pnictogen (–N, –P) Bonds

    Bhanja, Rosalin / Bera, Shyamal Kanti / Mal, Prasenjit

    Synthesis

    2024  

    Abstract: Pnictogens, classified within group 15 elements, play a pivotal role in the constitution of a diverse array of drug molecules, natural products, and functional materials. Recent research has increasingly prioritized the exploration of mild conditions for ...

    Abstract Pnictogens, classified within group 15 elements, play a pivotal role in the constitution of a diverse array of drug molecules, natural products, and functional materials. Recent research has increasingly prioritized the exploration of mild conditions for synthesizing C–Pnictogen (C–N and C–P) bonds, highlighting a growing emphasis on efficient and sustainable synthetic methodologies. This Short Review explores fundamental mechanisms, addresses constraints, and assesses diverse methodologies, underscoring the potential of photocatalyst- and transition-metal-free photochemical reactions in advancing sustainability. Divided into two segments, it encompasses recent advancements in reactions facilitating C–N and C–P bond formation. 1

    Introduction 2

    Carbon–Nitrogen (C–N) Bond Formation 3

    Carbon–Phosphorus (C–P) Bond Formation 4

    Summary and Outlook
    Keywords C–pnictogen bonds ; catalyst-free ; sustainable synthesis ; transition-metal-free photochemical reactions ; visible-light photocatalysis
    Language English
    Publishing date 2024-04-02
    Publisher Georg Thieme Verlag KG
    Publishing place Stuttgart ; New York
    Document type Article
    ZDB-ID 2033062-5
    ISSN 1437-210X ; 0039-7881
    ISSN (online) 1437-210X
    ISSN 0039-7881
    DOI 10.1055/a-2298-2106
    Database Thieme publisher's database

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  7. Article ; Online: Mechanochemical-Cascaded C-N Cross-Coupling and Halogenation Using

    Bera, Shyamal Kanti / Mal, Prasenjit

    The Journal of organic chemistry

    2021  Volume 86, Issue 20, Page(s) 14144–14159

    Abstract: Exploration of alternative energy sources for chemical transformations has gained significant interest from chemists, and mechanochemistry is one of those sources. Herein, we report the use ... ...

    Abstract Exploration of alternative energy sources for chemical transformations has gained significant interest from chemists, and mechanochemistry is one of those sources. Herein, we report the use of
    Language English
    Publishing date 2021-08-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.1c01742
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 4473: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  8. Article: Mechanochemical-Cascaded C–N Cross-Coupling and Halogenation Using N-Bromo- and N-Chlorosuccinimide as Bifunctional Reagents

    Bera, Shyamal Kanti / Mal, Prasenjit

    Journal of organic chemistry. 2021 Aug. 23, v. 86, no. 20

    2021  

    Abstract: Exploration of alternative energy sources for chemical transformations has gained significant interest from chemists, and mechanochemistry is one of those sources. Herein, we report the use of N-bromosuccinimides (NBS) and N-chlorosuccinimides (NCS) as ... ...

    Abstract Exploration of alternative energy sources for chemical transformations has gained significant interest from chemists, and mechanochemistry is one of those sources. Herein, we report the use of N-bromosuccinimides (NBS) and N-chlorosuccinimides (NCS) as bifunctional reagents for a cascaded C–N bond formation and subsequent halogenation reactions. Under the solvent-free mechanochemical (ball-milling) conditions, the synthesis of a wide range of phenanthridinone derivatives from N-methoxy-[1,1′-biphenyl]-2-carboxamides is accomplished. During the reactions, NBS and NCS first assisted the oxidative C–N coupling reaction and subsequently promoted a halogenation reaction. Thus, the role of NBS and NCS was established to be bifunctional. Overall, a mild, solvent-free, convenient, one-pot, and direct synthesis of various bromo- and chloro-substituted phenanthridinone derivatives was achieved.
    Keywords cross-coupling reactions ; mechanochemistry ; organic chemistry ; renewable energy sources
    Language English
    Dates of publication 2021-0823
    Size p. 14144-14159.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.1c01742
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 4' 49/42: Show issues
    Z 7.1: Show issues

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  9. Article ; Online: Unveiling the Untapped Potential of Bertagnini's Salts in Microwave-Assisted Synthesis of Quinazolinones.

    Bera, Shyamal Kanti / Behera, Sourav / De Luca, Lidia / Basoccu, Francesco / Mocci, Rita / Porcheddu, Andrea

    Molecules (Basel, Switzerland)

    2024  Volume 29, Issue 9

    Abstract: Microwave-assisted organic synthesis (MAOS) has emerged as a transformative technique in organic chemistry, significantly enhancing the speed, efficiency, and selectivity of chemical reactions. In our research, we have employed microwave irradiation to ... ...

    Abstract Microwave-assisted organic synthesis (MAOS) has emerged as a transformative technique in organic chemistry, significantly enhancing the speed, efficiency, and selectivity of chemical reactions. In our research, we have employed microwave irradiation to expedite the synthesis of quinazolinones, using water as an eco-friendly solvent and thereby adhering to the principles of green chemistry. Notably, the purification of the product was achieved without the need for column chromatography, thus streamlining the process. A key innovation in our approach is using aldehyde bisulfite adducts (Bertagnini's salts) as solid surrogates of aldehydes. Bertagnini's salts offer several advantages over free aldehydes, including enhanced stability, easier purification, and improved reactivity. Green metrics and Eco-Scale score calculations confirmed the sustainability of this approach, indicating a reduction in waste generation and enhanced sustainability outcomes. This methodology facilitates the synthesis of a diverse array of compounds, offering substantial contributions to the field, with potential for widespread applications in pharmaceutical research and beyond.
    Language English
    Publishing date 2024-04-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules29091986
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  10. Article: DDQ in mechanochemical C-N coupling reactions.

    Bera, Shyamal Kanti / Bhanja, Rosalin / Mal, Prasenjit

    Beilstein journal of organic chemistry

    2022  Volume 18, Page(s) 639–646

    Abstract: 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) is a commonly known oxidant. Herein, we report that DDQ can be used to synthesize 1,2-disubstituted benzimidazoles and quinazolin-4( ... ...

    Abstract 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) is a commonly known oxidant. Herein, we report that DDQ can be used to synthesize 1,2-disubstituted benzimidazoles and quinazolin-4(3
    Language English
    Publishing date 2022-06-01
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2192461-2
    ISSN 1860-5397
    ISSN 1860-5397
    DOI 10.3762/bjoc.18.64
    Database MEDical Literature Analysis and Retrieval System OnLINE

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