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  1. Article ; Online: Silylation of 2

    Das, Krishna Kanta / Hajra, Alakananda

    Organic & biomolecular chemistry

    2024  Volume 22, Issue 5, Page(s) 1034–1037

    Abstract: A metal-free, visible-light-mediated C-H silylation of ... ...

    Abstract A metal-free, visible-light-mediated C-H silylation of 2
    Language English
    Publishing date 2024-01-31
    Publishing country England
    Document type Journal Article
    ZDB-ID 2097583-1
    ISSN 1477-0539 ; 1477-0520
    ISSN (online) 1477-0539
    ISSN 1477-0520
    DOI 10.1039/d3ob01925j
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Site-selective direct nitration of 2

    Bhattacharjee, Suvam / Hajra, Alakananda

    Chemical communications (Cambridge, England)

    2024  Volume 60, Issue 30, Page(s) 4076–4079

    Abstract: A new site-selective methodology for C-H nitration of ... ...

    Abstract A new site-selective methodology for C-H nitration of 2
    Language English
    Publishing date 2024-04-09
    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/d4cc00214h
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Skeletal Editing through Molecular Recombination of 2H-Indazoles to Azo-Linked-Quinazolinones.

    Bhattacharjee, Suvam / Hajra, Alakananda

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2024  Volume 30, Issue 10, Page(s) e202303240

    Abstract: A new protocol by the combinatory use of two equivalent of indazoles starting material with one being the carbon source via its C3-reactivity and the other, the coupling partner has been developed for the selectfluor-mediated single atom skeletal editing ...

    Abstract A new protocol by the combinatory use of two equivalent of indazoles starting material with one being the carbon source via its C3-reactivity and the other, the coupling partner has been developed for the selectfluor-mediated single atom skeletal editing of 2H-indazoles. The azo-linked-2,3-disubstituted quinazolin-4-one derivatives were obtained through a carbon atom insertion between the two nitrogens of the indazole ring and simultaneous oxidation at C3 position of both indazole moieties. Mechanistic investigations reveal that the amidic carbonyl oxygen of the product is derived from water and the reaction proceeds through in-situ generated N-centred indazolone radical intermediate.
    Language English
    Publishing date 2024-01-04
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1478547-X
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.202303240
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Imino-λ

    Bhattacharjee, Suvam / Hajra, Alakananda

    Organic letters

    2023  Volume 25, Issue 22, Page(s) 4183–4187

    Abstract: An iminoiodane-enabled oxidative ring-opening of ... ...

    Abstract An iminoiodane-enabled oxidative ring-opening of 2
    MeSH term(s) Indazoles/chemistry ; Oxidation-Reduction ; Azo Compounds/chemistry ; Oxidative Stress
    Chemical Substances azobenzene (F0U1H6UG5C) ; Indazoles ; Azo Compounds
    Language English
    Publishing date 2023-05-31
    Publishing country United States
    Document type Journal Article
    ISSN 1523-7052
    ISSN (online) 1523-7052
    DOI 10.1021/acs.orglett.3c01498
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: An Electrochemical Oxo-amination of 2H-Indazoles: Synthesis of Symmetrical and Unsymmetrical Indazolylindazolones.

    Mondal, Koushik / Ghosh, Payel / Hajra, Alakananda

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2024  Volume 30, Issue 12, Page(s) e202303890

    Abstract: We have established a supporting-electrolyte free electrochemical method for the synthesis of indazolylindazolones through oxygen reduction reaction (eORR) induced 1,3-oxo-amination of 2H-indazoles where 2H-indazole is used as both aminating agent as ... ...

    Abstract We have established a supporting-electrolyte free electrochemical method for the synthesis of indazolylindazolones through oxygen reduction reaction (eORR) induced 1,3-oxo-amination of 2H-indazoles where 2H-indazole is used as both aminating agent as well as the precursor of indazolone. Moreover, we have merged indazolone and indazole to get unsymmetrical indazolylindazolones through direct electrochemical cross-dehydrogenative coupling (CDC). This exogenous metal-, oxidant- and catalyst-free protocol delivered a number of multi-functionalized products with high tolerance of diverse functional groups.
    Language English
    Publishing date 2024-01-09
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1478547-X
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.202303890
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  6. Article ; Online: Recent advances in carbosilylation of alkenes and alkynes.

    Pal, Prajna Paramita / Ghosh, Sumit / Hajra, Alakananda

    Organic & biomolecular chemistry

    2023  Volume 21, Issue 11, Page(s) 2272–2294

    Abstract: Alkene and alkyne difunctionalization is a flexible process that allows the construction of two functional groups simultaneously in one step. On the other hand, carbosilylation, an ingenious difunctionalization pathway to concurrently incorporate both a ... ...

    Abstract Alkene and alkyne difunctionalization is a flexible process that allows the construction of two functional groups simultaneously in one step. On the other hand, carbosilylation, an ingenious difunctionalization pathway to concurrently incorporate both a silyl group and an organic functional group (alkyl, (hetero)aryl, alkenyl, alkynyl and allenyl) across a carbon-carbon multiple-bond system, is achieving immense interest in recent days. This review article provides a decade's update on the discoveries and developments in the synthesis of carbosilylated products from two very important carbon-carbon unsaturated substrates, alkenes and alkynes.
    Language English
    Publishing date 2023-03-15
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2097583-1
    ISSN 1477-0539 ; 1477-0520
    ISSN (online) 1477-0539
    ISSN 1477-0520
    DOI 10.1039/d3ob00230f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Redox-neutral carbon-heteroatom bond formation under photoredox catalysis.

    Ghosh, Sumit / Majumder, Souvik / Ghosh, Debashis / Hajra, Alakananda

    Chemical communications (Cambridge, England)

    2023  Volume 59, Issue 46, Page(s) 7004–7027

    Abstract: Recently, visible-light-mediated photoredox catalysis has been emerging as one of the fastest growing fields in organic chemistry because of its low cost, easy availability and environmental benignness. In the past five years, a new yet challenging trend, ...

    Abstract Recently, visible-light-mediated photoredox catalysis has been emerging as one of the fastest growing fields in organic chemistry because of its low cost, easy availability and environmental benignness. In the past five years, a new yet challenging trend, visible-light-induced redox-neutral carbon-heteroatom bond formation reaction involving presumed radical intermediates, has been flourishing rapidly. Although mostly transition metal-based photoredox catalysts were reported, a few organophotoredox catalysts have also shown efficacy towards carbon-heteroatom bond formation reactions. This review intends to summarize the recent research progress in redox-neutral carbon-heteroatom bond formations based on active intermediate(s) involved under photoredox catalysis.
    Language English
    Publishing date 2023-06-06
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/d3cc01873c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Electrochemical C-H Sulfonylation of Hydrazones.

    Sarkar, Biswajit / Ghosh, Payel / Hajra, Alakananda

    Organic letters

    2023  Volume 25, Issue 19, Page(s) 3440–3444

    Abstract: We have developed an electrochemical method for the direct C-H sulfonylation of aldehyde hydrazones using sodium sufinates as the sulfonylating agent under supporting electrolyte-free conditions. This straightforward sulfonylation strategy afforded a ... ...

    Abstract We have developed an electrochemical method for the direct C-H sulfonylation of aldehyde hydrazones using sodium sufinates as the sulfonylating agent under supporting electrolyte-free conditions. This straightforward sulfonylation strategy afforded a library of (
    Language English
    Publishing date 2023-05-04
    Publishing country United States
    Document type Journal Article
    ISSN 1523-7052
    ISSN (online) 1523-7052
    DOI 10.1021/acs.orglett.3c00999
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: One-Pot Manganese (I)-Catalyzed Oxidant-Controlled Divergent Functionalization of 2-Arylindazoles.

    Kanta Das, Krishna / Kumar Ghosh, Asim / Hajra, Alakananda

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2023  Volume 30, Issue 4, Page(s) e202302849

    Abstract: The oxidant-controlled divergent synthesis of C-2' formyl 2H-indazoles and indazoloindazolediones has been developed through Mn(I)- catalyzed ortho C-H functionalization of 2H-indazoles with para-formaldehyde to afford C-2' hydroxymethylated 2H-indazoles ...

    Abstract The oxidant-controlled divergent synthesis of C-2' formyl 2H-indazoles and indazoloindazolediones has been developed through Mn(I)- catalyzed ortho C-H functionalization of 2H-indazoles with para-formaldehyde to afford C-2' hydroxymethylated 2H-indazoles and subsequently oxidation with varying the amount of DDQ in one-pot. By employing selectfluor as the oxidant instead of DDQ, this reaction exclusively provided indazolebenzoxazine derivatives. This strategy delivered unsymmetrical indazoloindazoledione and indazolobenzoxazine with varied functional group tolerance in moderate to good yields.
    Language English
    Publishing date 2023-11-27
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1478547-X
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.202302849
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  10. Article ; Online: Visible Light Induced Three-Component 1,2-Dicarbofunctionalization of Alkenes and Alkynes.

    Mohar, Mrittika / Ghosh, Sumit / Hajra, Alakananda

    Chemical record (New York, N.Y.)

    2023  Volume 23, Issue 11, Page(s) e202300121

    Abstract: Harnessing visible-light in organic synthesis is one of the most effective methods that aligns with green and sustainable chemistry principles and hence skyrocketed in the last two decades. Similarly, three-component 1,2-dicarbofunctionalization of ... ...

    Abstract Harnessing visible-light in organic synthesis is one of the most effective methods that aligns with green and sustainable chemistry principles and hence skyrocketed in the last two decades. Similarly, three-component 1,2-dicarbofunctionalization of alkenes and alkynes has recently been a great choice to construct complex molecular systems in an easy and rapid manner. Therefore, light-induced reactions can be an excellent alternative to carry out 1,2-dicarbofunctionalization reactions, and very recently, organic chemists across the globe have fascinated us with their interesting articles. In this present review, we have summarized the recent advancements in the area of visible light induced three-component 1,2-dicarbofunctionalization of alkenes and alkynes till March 2023. We have categorized the discussion based on the catalysts used to carry out the transformations for better understanding and different important aspects of these transformations have also been covered.
    Language English
    Publishing date 2023-06-12
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2044646-9
    ISSN 1528-0691 ; 1527-8999
    ISSN (online) 1528-0691
    ISSN 1527-8999
    DOI 10.1002/tcr.202300121
    Database MEDical Literature Analysis and Retrieval System OnLINE

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