Pragati Biswal

National Institute of Science Education and Research

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Ponneri C. Ravikumar

National Institute of Science Education and Research

Shyam Kumar Banjare

National Institute of Science Education and Research

Tanmayee Nanda

National Institute of Science Education and Research

Bedadyuti Vedvyas Pati

National Institute of Science Education and Research

Smruti Ranjan Mohanty

Deutsches Elektronen-Synchrotron DESY

Rajesh Chebolu

National Institute of Science Education and Research

Namrata Prusty

National Institute of Science Education and Research

Lokesh Kumar Gupta

National Institute of Science Education and Research

Smruti Ranjan Mohanty

Central Institute of Plastics Engineering and Technology

NAMRATA PRUSTY

Cooperative Institutions

National Institute of Science Education and Research

Homi Bhabha National Institute

University of California, Davis

National Institute Of Technology Silchar

University of Delhi

Indian Institute of Technology Mandi

Kaman (United States)

Indian Institute of Technology Bhubaneswar

Indian Institute of Technology Guwahati

TU Wien

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Palladium-Catalyzed C–C Bond Activation of Cyclopropenone: Modular Access to Trisubstituted α,β-Unsaturated Esters and Amides

The Journal of Organic Chemistry (2021)

Tanmayee Nanda Pragati Biswal Bedadyuti Vedvyas Pati Shyam Kumar Banjare Ponneri C. Ravikumar

Strain-driven palladium/N-heterocyclic carbene-catalyzed C–C bond activation of diphenylcyclopropenone (DPC) has been explored for one-step access to trisubstituted α,β-unsaturated esters and amides. The designed transformation works under mild conditions providing exclusively a single stereoisomer. Mechanistic studies support the oxidative addition of the C–C bond of cyclopropenone to in-situ-generated Pd(0) intermediate. We have proved that vinylic hydrogen in the product is coming from phenol/aniline through deuterium-labeling studies. Late-stage functionalization of bioactive molecules such as procaine, estrone, and hymecromone demonstrates the robustness of this protocol.

10.1021/acs.joc.0c02700

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N-Allylbenzimidazole as a strategic surrogate in Rh-catalyzed stereoselective trans-propenylation of aryl C(sp²)–H bond

Chemical Communications (2022)

Pragati Biswal Tanmayee Nanda Shyam Kumar Banjare S. R. Mohanty Ranjit Mishra

A Rh-catalyzed C(sp2)-H propenylation has been reported by taking N-allyl benzimidazole as an allylamine congener. This transformation has been observed for the first time, where a tandem process of C-H allylation followed by alkene isomerization delivers a highly stereoselective trans-propenylated product. Detailed mechanistic studies including the characterization of rhodacycle-intermediates have been conducted to understand the mechanism.

Alkene

Tandem

10.1039/d2cc06048e

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Recent Advancement in Palladium Catalysed C-C bond Activation of Strained Ring Systems: Three and four-membered carbocycles as prominent C3/C4 building blocks

Tanmayee Nanda Muhammed Fastheem Astha Linda Bedadyuti Vedvyas Pati Shyam Kumar Banjare

In recent years, transition metal catalysed strong C-C bond activation has significantly attracted the attention of synthetic chemists. This enables simultaneous and direct functionalization of two different M-C bonds. Among different types of C-C bond activation strategies, strain-driven C-C bond activation has resulted in a variety of transformations, which is otherwise impossible. In this context, palladium catalyst has been extensively used and studied due to its robust nature in terms of its reactivity and selectivity. Herein, we have provided a brief discussion about palladium catalysed C-C bond activation of three and four-membered cycloalkane derivatives.

Ring strain

Reactivity

Cycloalkane

10.26434/chemrxiv-2022-p8l62

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CCDC 1960668: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

Shyam Kumar Banjare Pragati Biswal Ponneri C. Ravikumar

10.5517/ccdc.csd.cc23t7ck

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Cobalt(III)-Catalyzed C-6 Alkenylation of 2-pyridones by using Terminal Alkyne with High Regioselectivity

Smruti Ranjan Mohanty NAMRATA PRUSTY Lokesh Gupta Pragati Biswal Ponneri C. Ravikumar

Alkyne

10.1021/scimeetings.3c00261

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CCDC 2053841: Experimental Crystal Structure Determination

The Cambridge Structural Database (2021)

Smruti Ranjan Mohanty Namrata Prusty Lokesh Kumar Gupta Pragati Biswal Ponneri C. Ravikumar

10.5517/ccdc.csd.cc26y5y9

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Cobalt(III)-Catalyzed C-6 Alkenylation of 2-pyridones by using Terminal Alkyne with High Regioselectivity

smrutiranjan Mohanty NAMRATA PRUSTY Lokesh Kumar Gupta Pragati Biswal Ponneri C. Ravikumar

In order to view the entire gallery of posters, videos, and other materials, please click "Submissions" below. To find the Q&A for each poster category, please click "Sessions" below. To ask a question, simply click on the session of interest. You will see a list of video presentations to the right. Below each video area, you'll see a section entitled 'Q&A for this presentation'. Here you can post questions to the presenters. They will be notified, and you'll also be notified when they reply to your question. You can expect that notification by email, and you'll find the author's response here.

Alkyne

10.26226/morressier.614222335a6b32ccbe148082

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Recent Advancement in Palladium-Catalyzed C–C Bond Activation of Strained Ring Systems: Three- and Four-Membered Carbocycles as Prominent C3/C4 Building Blocks

ACS Catalysis (2022)

Tanmayee Nanda Muhammed Fastheem Astha Linda Bedadyuti Vedvyas Pati Shyam Kumar Banjare

In recent years, transition metal-catalyzed strong C–C bond activation has significantly attracted the attention of synthetic chemists. This protocol enables simultaneous and direct functionalization of two different M–C bonds. Among different types of C–C bond activation strategies, strain-driven C–C bond activation has resulted in various otherwise difficult transformations. In this context, palladium catalyst has been extensively used and studied due to its robust reactivity and selectivity. Herein we have briefly discussed palladium-catalyzed C–C bond activation of three- and four-membered cycloalkane derivatives.

Reactivity

Ring strain

Cycloalkane

10.1021/acscatal.2c02667

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Citations (29)

Rhodium Catalyzed Stereoselective Mono-alkenylation of Aryl sp2 C-H Bond via C-N Bond Cleavage: N-allylbenzimidazole as Strategic Alkenylating Agent

Pragati Biswal Tanmayee Nanda Shyam Kumar Banjare Smruti Ranjan Mohanty Ponneri C. Ravikumar

A Rh-catalyzed C(sp2)-H alkenylation has been achieved by taking N-allylbenzimidazole as an allylamine congener. This distinctive transformation has been observed for the first time which is attributed to the rigid benzimidazole unit. Lewis acid assisted cleavage of C(sp3)-N bond by coordinating to the N3 of N-allylbenzimidazole has been established. Thus, herein we have demonstrated an unprecedented protocol of domino C-N bond cleavage followed by aryl C(sp2)-H alkenylation. Further, detailed mechanistic studies, control experiments have been conducted to understand the mechanism. The rhodacycle-intermediates involved in the reaction have been isolated and characterized through NMR, HRMS, and single crystal X-ray.

Bond cleavage

Cleavage (geology)

Benzimidazole

10.33774/chemrxiv-2021-w1d35

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CCDC 2053823: Experimental Crystal Structure Determination

The Cambridge Structural Database (2021)

Smruti Ranjan Mohanty Namrata Prusty Lokesh Kumar Gupta Pragati Biswal Ponneri C. Ravikumar

10.5517/ccdc.csd.cc26y5cq

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Citations (0)