Morpholine as a privileged scaffold for neurodegenerative disease therapeutics Saranya Kattil Parmbil, Sunil Kumar, T. M. Rangarajan, Della Grace Thomas Parambi, Naseer Maliyakkal, Anél Petzer, Jacobus P. Petzer, Bijo Mathew Rsc Advances, 2026 The review emphasizes the importance of morpholine derivatives in advancing CNS therapeutics and their potential role in addressing unmet medical needs in neuropsychiatric disorder treatments.
Recent Progress in Synthetic and Natural Catechol-O-methyltransferase Inhibitors for Neurological Disorders Sandeep Bindra, Ananya Datta, Haya Khader Ahmad Yasin, Riya Rachel Thomas, Shailesh Verma, Ankita Patel, Della Grace Thomas Parambi, Suraj N. Mali, T. M. Rangarajan, Bijo Mathew ACS Omega, 2024 -methyltransferase (COMT) inhibitors have played a crucial role in the development of potent and selective drugs for the treatment of Parkinson's disease, depression, and anxiety disorders. This review provides a comprehensive analysis of the structure-activity relationship (SAR) of COMT inhibitors, highlighting key structural features and pharmacophoric elements that govern their potency, selectivity, and pharmacokinetic properties. This review also discusses the application of SAR principles in the design and optimization of COMT inhibitors. Our analysis reveals the emergence of novel chemical scaffolds and the potential for COMT inhibitors to address unmet medical needs in neurology and psychiatry. This Perspective serves as a valuable resource for clinicians and researchers, providing insights into the rational design of COMT inhibitors and the development of next-generation therapeutics.
Oxime Derivatives: A Valid Pharmacophore in Medicinal Chemistry Namitha Chandran, Kuntal Bose, Amrutha Chandran Thekkantavida, Riya Rachel Thomas, Karthika Anirudhan, Sandeep Bindra, Sooraj Sura, Haydara Ammar Hasan, Sunil Kumar, T. M. Rangarajan, Abdullah G. Al‐Sehemi, Prashant Gahtori, Hoon Kim, Bijo Mathew Chemistryselect, 2024 Oximes, belonging to imines with the general formula of RR'C=NOH, are produced by the nucleophilic addition reaction between hydroxylamine with ketones or aldehydes, yielding corresponding aldoxime and ketoxime. The presence of hydrogen bond acceptor and donor is the classical feature of oxime‐containing structural framework. This review presents a summary of the role of oximes and its structure activity relationships including antimicrobial, anticancer, anti‐inflammatory, antihyperglycemic, insecticidal agents, along with their involvement in the treatment of organophosphorus poisoning. The review also focused on the pharmacological profile of lead molecules of several classes of oxime‐containing compounds.
A Comprehensive Review of the Docking Studies of Chalcone for the Development of Selective MAO-B Inhibitors Athulya Krishna, Sunil Kumar, Sachithra Thazhathuveedu Sudevan, Ashutosh Kumar Singh, Leena K. Pappachen, T.M. Rangarajan, Mohamed A. Abdelgawad, Bijo Mathew CNS and Neurological Disorders Drug Targets, 2024 Monoamine oxidase B is a crucial therapeutic target for neurodegenerative disorders like Alzheimer's and Parkinson's since they assist in disintegrating neurotransmitters such as dopamine in the brain. Pursuing efficacious monoamine oxidase B inhibitors is a hot topic, as contemporary therapeutic interventions have many shortcomings. Currently available FDA-approved monoamine oxidase inhibitors like safinamide, selegiline and rasagiline also have a variety of side effects like depression and insomnia. In the quest for a potent monoamine oxidase B inhibitor, sizeable, diverse chemical entities have been uncovered, including chalcones. Chalcone is a renowned structural framework that has been intensively explored for its monoamine oxidase B inhibitory activity.The structural resemblance of chalcone (1,3-diphenyl-2-propen-1-one) based compounds and 1,4-diphenyl- 2-butene, a recognized MAO-B inhibitor, accounts for their MAO-B inhibitory activity. Therefore, multiple revisions to the chalcone scaffold have been attempted by the researchers to scrutinize the implications of substitutions onthe molecule's potency. In this work, we outline the docking investigation results of various chalcone analogues with monoamine oxidase B available in the literature until now to understand the interaction modes and influence of substituents. Here we focused on the interactions between reported chalcone derivatives and the active site of monoamine oxidase B and the influence of substitutions on those interactions. Detailed images illustrating the interactions and impact of the substituents or structural modifications on these interactions were used to support the docking results.
“Click Chemistry”: An Emerging Tool for Developing a New Class of Structural Motifs against Various Neurodegenerative Disorders Amritha Manoharan, Jayalakshmi Jayan, T. M. Rangarajan, Kuntal Bose, Feba Benny, Reshma Susan Ipe, Sunil Kumar, Neelima Kukreti, Mohamed A. Abdelgawad, Mohammed M. Ghoneim, Hoon Kim, Bijo Mathew ACS Omega, 2023 Click chemistry is a set of easy, atom-economical reactions that are often utilized to combine two desired chemical entities. Click chemistry accelerates lead identification and optimization, reduces the complexity of chemical synthesis, and delivers extremely high yields without undesirable byproducts. The most well-known click chemistry reaction is the 1,3-dipolar cycloaddition of azides and alkynes to form 1,2,3-triazoles. The resulting 1,2,3-triazoles can serve as both bioisosteres and linkers, leading to an increase in their use in the field of drug discovery. The current Review focuses on the use of click chemistry to identify new molecules for treating neurodegenerative diseases and in other areas such as peptide targeting and the quantification of biomolecules.
Morpholine as a privileged scaffold for neurodegenerative disease therapeutics SK Parmbil, S Kumar, TM Rangarajan, DGT Parambi, N Maliyakkal, ... RSC advances 16 (14), 12408-12443 , 2026 2026 Citations: 1
Oxime functionalized Chalcones: Unveiling a new class of Chalcones with potent Antiplasmodial activity against blood-stages of Plasmodium falciparum in culture R Chaudhary, V Rajendran, TM Rangarajan Bioorganic & medicinal chemistry letters 121, 130143 , 2025 2025
Deep eutectic solvents (DESs): emerging viable solvent systems for transition-metal-catalyzed cross-coupling reactions S Pasricha, P Gahlot, TM Rangarajan, H Pahuja, D Yadav, K Pilania, ... Journal of Molecular Liquids 426, 127287 , 2025 2025 Citations: 7
Greener media for nano catalysts in Suzuki Miyaura reaction S Pasricha, A Srivastava, S Yadav, A Sunny, N Tuwani, TM Rangarajan, ... Coordination Chemistry Reviews 528, 216431 , 2025 2025 Citations: 11
Unveiling the choline chloride–thiourea (1: 1) DES as a greener medium and reagent for pyrimidinethione synthesis from α, β-unsaturated carbonyl compounds A Singhal, A Yadav, S Vashisht, K Tyagi, TM Rangarajan, S Pasricha Organic & Biomolecular Chemistry 23 (20), 4951-4959 , 2025 2025 Citations: 3
Recent Progress in Synthetic and Natural Catechol- O -methyltransferase Inhibitors for Neurological Disorders S Bindra, A Datta, HKA Yasin, RR Thomas, S Verma, A Patel, ... ACS omega 9 (44), 44005-44018 , 2024 2024 Citations: 4
Oxime Derivatives: A Valid Pharmacophore in Medicinal Chemistry BM . Chandran, K. Bose, A. C. Thekkantavida, R. R. Thomas, K. Anirudhan, S ... ChemistrySelect 9 , 2024 2024 Citations: 21
A comprehensive review of the docking studies of chalcone for the development of selective MAO-B inhibitors A Krishna, S Kumar, ST Sudevan, AK Singh, LK Pappachen, ... CNS & Neurological Disorders-Drug Targets-CNS & Neurological Disorders) 23 … , 2024 2024 Citations: 10
Optimal exploitation of supported heterogenized Pd nanoparticles for CC cross-coupling reactions A Srivastava, H Kaur, H Pahuja, TM Rangarajan, RS Varma, S Pasricha Coordination Chemistry Reviews 507, 215763 , 2024 2024 Citations: 44
Two dimensional-QSAR and molecular dynamics studies of a selected class of aldoxime-and hydroxy-functionalized chalcones as monoamine oxidase-B inhibitors B Mathew, V Ravichandran, S Raghuraman, TM Rangarajan, ... Journal of Biomolecular Structure and Dynamics 41 (19), 9256-9266 , 2023 2023 Citations: 15
“Click Chemistry”: An Emerging Tool for Developing a New Class of Structural Motifs against Various Neurodegenerative Disorders A Manoharan, J Jayan, TM Rangarajan, K Bose, F Benny, RS Ipe, ... ACS omega 8 (47), 44437-44457 , 2023 2023 Citations: 34
Exploration of a new class of monoamine oxidase B inhibitors by assembling benzyloxy pharmacophore on halogenated chalcones AK Singh, SM Kim, JM Oh, MA Abdelgawad, MM Ghoneim, ... Chemical Biology & Drug Design 102 (2), 271-284 , 2023 2023 Citations: 11
Langlois Reagent: An Efficient Trifluoromethylation Reagent K Anusha, M Mahesh, S Shikha, TM Rangarajan, S Pasricha SynOpen 7 (01), 65-68 , 2023 2023 Citations: 1
Green Acetylation of Primary Aromatic Amines S Pasricha, TM Rangarajan Resonance 28 (2), 325-331 , 2023 2023 Citations: 4
Solid-supported heterogenized palladium nanoparticles: Propitious vehicles for Sonogashira cross-coupling reaction A Srivastava, N Avasthi, S Anand, D Yadav, TM Rangarajan, S Pasricha SynOpen 7 (01), 43-45 , 2023 2023 Citations: 8
An efficient method to access spiro pseudoindoxyl ketones: evaluation of indoxyl and their N-benzylated derivatives for inhibition of the activity of monoamine oxidases K Perumal, J Lee, SB Annes, S Ramesh, TM Rangarajan, B Mathew, ... RSC advances 13 (36), 24925-24935 , 2023 2023 Citations: 2
Introduction of benzyloxy pharmacophore into aryl/heteroaryl chalcone motifs as a new class of monoamine oxidase B inhibitors HKBM Sachithra Thazhathuveedu Sudevan, Jong Min Oh, Mohamed A. Abdelgawad ... scientific reports 12, 22404 , 2022 2022 Citations: 36
FDA-approved trifluoromethyl group-containing drugs: A review of 20 years AS Nair, AK Singh, A Kumar, S Kumar, S Sukumaran, VP Koyiparambath, ... Processes 10 (10), 2054 , 2022 2022 Citations: 201
Development of 2D, 3D-QSAR and pharmacophore modeling of chalcones for the inhibition of monoamine oxidase B B Mathew, C Herrera-Acevedo, S Dev, TM Rangarajan, MS Kuruniyan, ... Combinatorial Chemistry & High Throughput Screening 25 (10), 1731-1744 , 2022 2022 Citations: 6
Revealing the role of the benzyloxy pharmacophore in the design of a new class of monoamine oxidase‐B inhibitors BM Sachithra T. Sudevan,T. M. Rangarajan, Abdullah G. Al-Sehemi, Aathira S ... Arch Pharm. , 2022 2022 Citations: 24
MOST CITED SCHOLAR PUBLICATIONS
FDA-approved trifluoromethyl group-containing drugs: A review of 20 years AS Nair, AK Singh, A Kumar, S Kumar, S Sukumaran, VP Koyiparambath, ... Processes 10 (10), 2054 , 2022 2022 Citations: 201
BrettPhos Ligand Supported Palladium‐Catalyzed C O Bond Formation through an Electronic Pathway of Reductive Elimination: Fluoroalkoxylation of Activated Aryl Halides TM Rangarajan, R Singh, R Brahma, K Devi, RP Singh, RP Singh, ... Chemistry–A European Journal 20 (44), 14218-14225 , 2014 2014 Citations: 72
Deciphering the detailed structure-activity relationship of coumarins as Monoamine oxidase enzyme inhibitors-An updated review K Vishal Payyalot, PR Krishnendu, TM Rangarajan, GAS Abdullah, ... Chemical Biology & Drug Design , 2021 2021 Citations: 58
Novel class of chalcone oxime ethers as potent monoamine oxidase-B and acetylcholinesterase inhibitors JM Oh, TM Rangarajan, R Chaudhary, RP Singh, M Singh, RP Singh, ... Molecules 25 (10), 2356 , 2020 2020 Citations: 53
Optimal exploitation of supported heterogenized Pd nanoparticles for CC cross-coupling reactions A Srivastava, H Kaur, H Pahuja, TM Rangarajan, RS Varma, S Pasricha Coordination Chemistry Reviews 507, 215763 , 2024 2024 Citations: 44
Introduction of benzyloxy pharmacophore into aryl/heteroaryl chalcone motifs as a new class of monoamine oxidase B inhibitors HKBM Sachithra Thazhathuveedu Sudevan, Jong Min Oh, Mohamed A. Abdelgawad ... scientific reports 12, 22404 , 2022 2022 Citations: 36
“Click Chemistry”: An Emerging Tool for Developing a New Class of Structural Motifs against Various Neurodegenerative Disorders A Manoharan, J Jayan, TM Rangarajan, K Bose, F Benny, RS Ipe, ... ACS omega 8 (47), 44437-44457 , 2023 2023 Citations: 34
Mild and efficient palladium/BrettPhos-catalyzed methoxylation and deuteriomethoxylation of activated aryl bromides TM Rangarajan, R Brahma, AK Prasad, AK Verma, RP Singh Tetrahedron Letters 56 (17), 2234-2237 , 2015 2015 Citations: 31
Ethyl acetohydroxamate incorporated chalcones: unveiling a novel class of chalcones for multitarget monoamine oxidase-B inhibitors against Alzheimer’s disease SC Baek, JP Lee, TM Rangarajan, RP Singh, M Singh, GF Mangiatordi, ... CNS & Neurological Disorders-Drug Targets (Formerly Current Drug Targets-CNS … , 2019 2019 Citations: 29
A general, mild and efficient palladium-catalyzed 2, 2, 2-trifluoroethoxylation of activated aryl bromides and bromo-chalcones: bromo-chalcones a new coupling partner in cross … TM Rangarajan, K Devi, AK Prasad, RP Singh Tetrahedron 71 (43), 8307-8314 , 2015 2015 Citations: 27
Revealing the role of the benzyloxy pharmacophore in the design of a new class of monoamine oxidase‐B inhibitors BM Sachithra T. Sudevan,T. M. Rangarajan, Abdullah G. Al-Sehemi, Aathira S ... Arch Pharm. , 2022 2022 Citations: 24
Current Progress in Quinazoline Derivatives as Acetylcholinesterase and Monoamine Oxidase Inhibitors DBM Nisha Abdul Rehuman, Prof. Abdullah G. Al-Sehemi, Dr. Della Grace Thomas ... ChemistrySelect 6 (28), 7162-7182 , 2021 2021 Citations: 24
Oxime Derivatives: A Valid Pharmacophore in Medicinal Chemistry BM . Chandran, K. Bose, A. C. Thekkantavida, R. R. Thomas, K. Anirudhan, S ... ChemistrySelect 9 , 2024 2024 Citations: 21
Recent updates on pyrazoline derivatives as promising candidates for neuropsychiatric and neurodegenerative disorders TM Rangarajan, B Mathew Current Topics in Medicinal Chemistry 21 (30), 2695-2714 , 2021 2021 Citations: 19
Two dimensional-QSAR and molecular dynamics studies of a selected class of aldoxime-and hydroxy-functionalized chalcones as monoamine oxidase-B inhibitors B Mathew, V Ravichandran, S Raghuraman, TM Rangarajan, ... Journal of Biomolecular Structure and Dynamics 41 (19), 9256-9266 , 2023 2023 Citations: 15
Aldoxime-and hydroxy-functionalized chalcones as highly potent and selective monoamine oxidase-B inhibitors JM Oh, TM Rangarajan, R Chaudhary, N Gambacorta, O Nicolotti, ... Journal of Molecular Structure 1250, 131817 , 2022 2022 Citations: 15
Replacement of chalcone-ethers with chalcone-thioethers as potent and highly selective monoamine oxidase-B inhibitors and their protein-ligand interactions B Mathew, JM Oh, A Khames, MA Abdelgawad, TM Rangarajan, LR Nath, ... Pharmaceuticals 14 (11), 1148 , 2021 2021 Citations: 15
Products formed at intermediate stages of electrochemical perfluorination of propionyl and n-butyryl chlorides. Further evidence in support of NiF3 mediated free radical pathway TM Rangarajan, S Sathyamoorthi, D Velayutham, M Noel, RP Singh, ... Journal of Fluorine Chemistry 132 (2), 107-113 , 2011 2011 Citations: 14
Greener media for nano catalysts in Suzuki Miyaura reaction S Pasricha, A Srivastava, S Yadav, A Sunny, N Tuwani, TM Rangarajan, ... Coordination Chemistry Reviews 528, 216431 , 2025 2025 Citations: 11
Exploration of a new class of monoamine oxidase B inhibitors by assembling benzyloxy pharmacophore on halogenated chalcones AK Singh, SM Kim, JM Oh, MA Abdelgawad, MM Ghoneim, ... Chemical Biology & Drug Design 102 (2), 271-284 , 2023 2023 Citations: 11