Department Of Chemistry

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Author: search.filters.author.Gujjarappa, RaghuramSubject: search.filters.subject.Benzimidazoles

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    An Overview on Biological Activity of Benzimidazole Derivatives
    (Springer Nature, 2022-03-07T00:00:00) Kabi, Arup K.; Sravani, Sattu; Gujjarappa, Raghuram; Garg, Aakriti; Vodnala, Nagaraju; Tyagi, Ujjawal; Kaldhi, Dhananjaya; Singh, Virender; Gupta, Sreya; Malakar, Chandi C.
    Benzimidazole moiety plays a key role in variety of heterocyclic scaffolds which derive the biological functioning of essential molecules. Because of the skeletal resemblance with the naturally appearing nucleotides, benzimidazole and its analogues exhibited numerous medicinal and pharmacological performances. They are appraised as the auspicious class of bioactive molecules which endorse diverse actions like antiprotozoal, antimicrobial, antimalarial, anti-helminthic, anti-inflammatory, anti-mycobacterial, antiviral, and antiparasitic. Moreover, benzimidazole has recognized paramount responses in current years and is an enormously important pharmacophoric heterocyclic moieties in recent drug innovations and medicinal chemistry. This chapter will be beneficial for the researchers working in the fields of medicinal chemistry in visualizing the diverse pharmacological activities of benzimidazole derivatives in developing a SAR on benzimidazole drugs. � 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    Transition-Metal-Free Transfer Hydrogenative Cascade Reaction of Nitroarenes with Amines/Alcohols: Redox-Economical Access to Benzimidazoles
    (American Chemical Society, 2021-10-19T00:00:00) Kabi, Arup K.; Gujjarappa, Raghuram; Roy, Anupam; Sahoo, Abhishek; Musib, Dulal; Vodnala, Nagaraju; Singh, Virender; Malakar, Chandi C.
    This report describes an efficient transition-metal-free process toward the transfer hydrogenative cascade reaction between nitroarenes and amines or alcohols. The developed redox-economical approach was realized using a combination of KOtBu and Et3SiH as reagents, which allows the synthesis of benzimidazole derivatives via ?-bond metathesis. The reaction conditions hold well over a wide range of substrates embedded with diverse functional groups to deliver the desired products in good to excellent yields. The mechanistic proposal has been depicted on the basis of a series of control experiments, mass spectroscopic evidence which is well supported by density functional theory (DFT) calculations with a feasible energy profile. � 2021 American Chemical Society.