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  1. Article: Tosylhydrazine-promoted self-conjugate reduction-Michael/aldol reaction of 3-phenacylideneoxindoles towards dispirocyclopentanebisoxindole derivatives.

    Pramanik, Sayan / Mukhopadhyay, Chhanda

    Beilstein journal of organic chemistry

    2022  Volume 18, Page(s) 469–478

    Abstract: An efficient tosylhydrazine-mediated conjugate reduction of 3-phenacylideneoxindole and sequential Michael/intramolecular aldol reaction is reported under base-catalyzed conditions towards the formation of densely substituted ... ...

    Abstract An efficient tosylhydrazine-mediated conjugate reduction of 3-phenacylideneoxindole and sequential Michael/intramolecular aldol reaction is reported under base-catalyzed conditions towards the formation of densely substituted dispirocyclopentanebisoxindole derivatives. The reaction proceeded in a diastereoselective manner to afford four chiral stereocenters. The method also has advantages of wide substrate scope, readily available starting materials and operational simplicity through one pot reaction.
    Language English
    Publishing date 2022-04-27
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2192461-2
    ISSN 1860-5397
    ISSN 1860-5397
    DOI 10.3762/bjoc.18.49
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Substrate Switchable Pathway for Selective Construction of Bridged Dibenzo[b,f][1,5]diazocines and Bridged Spiromethanodibenzo[

    Pramanik, Sayan / Saha, Pinaki / Ghosh, Prasanta / Mukhopadhyay, Chhanda

    ACS omega

    2023  Volume 8, Issue 23, Page(s) 20579–20588

    Abstract: An operationally simple method for the synthesis of bridged dibenzo[b,f][1,5]diazocines and bridged spiromethanodibenzo[ ...

    Abstract An operationally simple method for the synthesis of bridged dibenzo[b,f][1,5]diazocines and bridged spiromethanodibenzo[
    Language English
    Publishing date 2023-06-01
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.3c01046
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  3. Article ; Online: Metal-free, I

    Sarkar, Prabhat / Saha, Pinaki / Ghosh, Prasanta / Mukhopadhyay, Chhanda

    Organic & biomolecular chemistry

    2023  Volume 21, Issue 4, Page(s) 789–796

    Abstract: A robust, ... ...

    Abstract A robust, I
    Language English
    Publishing date 2023-01-25
    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/d2ob01725c
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  4. Article ; Online: Steric-Hindrance-Induced Diastereoselective Radical Nitration of 3-Alkylidene-2-oxindoles Followed by Tosylhydrazine-Mediated Sulfonation.

    Pramanik, Sayan / Saha, Pinaki / Ghosh, Prasanta / Mukhopadhyay, Chhanda

    The Journal of organic chemistry

    2023  Volume 88, Issue 6, Page(s) 3386–3402

    Abstract: Metal-free radical nitration of the β C-H bond of 3-alkylidene-2-oxindoles ... ...

    Abstract Metal-free radical nitration of the β C-H bond of 3-alkylidene-2-oxindoles with
    Language English
    Publishing date 2023-02-27
    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.2c01523
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    Zs.A 4473: Show issues Location:
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  5. Article ; Online: DMSO promoted catalyst-free oxidative C-N/C-O couplings towards synthesis of imidazoles and oxazoles.

    Bera, Debasish / Sarkar, Rajib / Dhar, Tiyasa / Saha, Pinaki / Ghosh, Prasanta / Mukhopadhyay, Chhanda

    Organic & biomolecular chemistry

    2024  Volume 22, Issue 18, Page(s) 3684–3692

    Abstract: Dimethyl sulfoxide (DMSO)-promoted catalyst-free oxidative C-N coupling and C-O coupling under oxidant-free conditions are outlined. This protocol is operationally simple and leads to various functionalized substituted imidazoles or oxazoles in good ... ...

    Abstract Dimethyl sulfoxide (DMSO)-promoted catalyst-free oxidative C-N coupling and C-O coupling under oxidant-free conditions are outlined. This protocol is operationally simple and leads to various functionalized substituted imidazoles or oxazoles in good yields. To date, a very limited number of oxidation protocols have been established, where DMSO acts solely as a catalyst or an oxidant or both. In this report, DMSO is not only used as a C-N/C-O coupling agent but is also used as the oxidant required for these oxidative transformations. Hence, our demonstrated DMSO-promoted catalyst-free coupling transformation has the ability to lead to a new dimension in the field of oxidative coupling.
    Language English
    Publishing date 2024-05-08
    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/d4ob00383g
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  6. Article ; Online: Aqueous mediated iodine catalyzed C-N coupling followed by C-C coupling towards 5

    Bera, Debasish / Sarkar, Rajib / Saha, Pinaki / Ghosh, Prasanta / Mukhopadhyay, Chhanda

    Chemical communications (Cambridge, England)

    2023  Volume 59, Issue 50, Page(s) 7771–7774

    Abstract: Our study describes a new development featuring iodine-catalyzed two consecutive oxidative cross-coupling reactions involving ... ...

    Abstract Our study describes a new development featuring iodine-catalyzed two consecutive oxidative cross-coupling reactions involving C
    Language English
    Publishing date 2023-06-20
    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/d3cc01631e
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  7. Article ; Online: An environment-friendly methodology for the construction of diversified bicycloacenaphtho[1,2-d]imidazole-8-thione scaffolds using spinel NiFe

    Rana, Soumitra / Basu, Soumyadip / Mukhopadhyay, Chhanda

    Molecular diversity

    2022  Volume 26, Issue 5, Page(s) 2561–2573

    Abstract: Herein, we successfully developed an easy access to bicycloacenaphtho[1,2-d]imidazole-8-thione by one-pot three-component MCRs of acenaphthoquinone, aryl or alkyl isothiocyanates and amines using environmentally benevolent and recyclable spinel ... ...

    Abstract Herein, we successfully developed an easy access to bicycloacenaphtho[1,2-d]imidazole-8-thione by one-pot three-component MCRs of acenaphthoquinone, aryl or alkyl isothiocyanates and amines using environmentally benevolent and recyclable spinel NiFe
    MeSH term(s) Aluminum Oxide ; Amines ; Catalysis ; Ethanol ; Ferric Compounds ; Imidazoles ; Isothiocyanates ; Magnesium Oxide ; Metal Nanoparticles ; Nanoparticles ; Nickel ; Thiones
    Chemical Substances Amines ; Ferric Compounds ; Imidazoles ; Isothiocyanates ; Thiones ; nickel ferrite ; spinell ; Magnesium Oxide (3A3U0GI71G) ; Ethanol (3K9958V90M) ; Nickel (7OV03QG267) ; Aluminum Oxide (LMI26O6933)
    Language English
    Publishing date 2022-01-03
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1376507-3
    ISSN 1573-501X ; 1381-1991
    ISSN (online) 1573-501X
    ISSN 1381-1991
    DOI 10.1007/s11030-021-10356-7
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 4946: Show issues Location:
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  8. Article: Generation of I-, ArS- and ArSe- substituted pyrrolo[3,4–c]pyridine derivatives using copper iodide as an iodinating agent

    Maity, Pampa / Sarkar, Piyali / Mukhopadhyay, Chhanda

    Tetrahedron letters. 2021 Nov. 23, v. 85

    2021  

    Abstract: A new, efficient and operationally simple copper mediated C−I, CS and C−Se bond formation protocol has been developed. This process proceeds smoothly under mild aerobic condition to give CH iodinated, sulfenylated and selenenylated pyrrolo[3,4–c] ... ...

    Abstract A new, efficient and operationally simple copper mediated C−I, CS and C−Se bond formation protocol has been developed. This process proceeds smoothly under mild aerobic condition to give CH iodinated, sulfenylated and selenenylated pyrrolo[3,4–c]pyridines derivative. The versatility of this process has been successfully established by simply varying different electrophile. This copper iodide-mediated CH functionalization approach provides a direct access of structurally diverse 7-iodinated/sulfenylated/selenenylated pyrrolo[3,4–c]pyridine derivatives in good to excellent yield within short reaction time.
    Keywords Lewis acids ; copper ; iodides ; pyridines
    Language English
    Dates of publication 2021-1123
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 204287-3
    ISSN 1873-3581 ; 0040-4039
    ISSN (online) 1873-3581
    ISSN 0040-4039
    DOI 10.1016/j.tetlet.2021.153479
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    Zs.A 2837: Show issues Location:
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  9. Article ; Online: FeCl

    Basu, Soumyadip / Rana, Soumitra / Saha, Pinaki / Ghosh, Prasanta / Mukhopadhyay, Chhanda

    The Journal of organic chemistry

    2022  Volume 87, Issue 15, Page(s) 9755–9763

    Abstract: An iron-catalyst mediated one-pot multicomponent route for the synthesis of novel 6-thioxo-hexahydroindeno[1',2':4,5]imidazo[1,5- ...

    Abstract An iron-catalyst mediated one-pot multicomponent route for the synthesis of novel 6-thioxo-hexahydroindeno[1',2':4,5]imidazo[1,5-
    MeSH term(s) Catalysis ; Molecular Structure ; Oxygen ; Pyridones
    Chemical Substances Pyridones ; Oxygen (S88TT14065)
    Language English
    Publishing date 2022-07-15
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.2c00788
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  10. Article: Intramolecular Ullmann-type C−N coupling for the synthesis of substituted benzo[4,5]imidazo[1,2-a]pyrrolo[3,4-c]pyridines

    Maity, Pampa / Mukhopadhyay, Chhanda

    Tetrahedron. 2019 July 24,

    2019  

    Abstract: An efficient CuI catalyzed intramolecular Ullmann-type C−N coupling reaction is described here. Newly substituted 1H-benzo[4,5]imidazo[1,2-a]pyrrolo[3,4-c]pyridine-1,3,5(2H, 11H)-trione has been easily synthesized from ortho halogenated N-substituted ... ...

    Abstract An efficient CuI catalyzed intramolecular Ullmann-type C−N coupling reaction is described here. Newly substituted 1H-benzo[4,5]imidazo[1,2-a]pyrrolo[3,4-c]pyridine-1,3,5(2H, 11H)-trione has been easily synthesized from ortho halogenated N-substituted pyrrolo[3,4-c]pyridine-1,3,6(5H)-triones in presence of CuI catalyst and K2CO3 base without any ligand. This procedure is based on intramolecular Ullmann-type reaction and provides a proficient method of making fused tetracyclic heterocycles.
    Keywords catalysts ; catalytic activity ; chemical reactions ; chemical structure ; ligands ; potassium carbonate ; pyridines
    Language English
    Dates of publication 2019-0724
    Publishing place Elsevier Ltd
    Document type Article
    Note Pre-press version
    ZDB-ID 204285-x
    ISSN 1464-5416 ; 0040-4020 ; 0563-2064
    ISSN (online) 1464-5416
    ISSN 0040-4020 ; 0563-2064
    DOI 10.1016/j.tet.2019.130473
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