Design and Synthesis of S-Acetophenylhydrazones of 5-Methyl-1,3,4-Thiadiazole-2-Thiol as SHP2 Inhibitory Agents Rangan Mitra, Sandeep Kumar, Aiswarya Chaudhuri, Shreyasi Majumdar, Sairam Krishnamurthy, et al. Chemistry and Biodiversity, 2025 We report herein the rational design, synthesis and evaluation of a library of 21 S‐acetophenylhydrazones of 5‐methyl‐1,3,4‐thiadiazole‐2‐thiol bearing a substituted benzylidene moiety (compounds 5a–5u). Compound 5f ((E)‐N'‐(2,6‐dichlorobenzylidene)‐2‐((5‐methyl‐1,3,4‐thiadiazol‐2‐yl)thio)acetohydrazide) emerged as the most potent SHP2 inhibitor (IC50 = 0.120 ± 0.006 µM). Further, cell‐based studies revealed its moderate yet best‐in‐library cytotoxicity against MCF‐7 cells (IC50 = 86.46 ± 2.32 µM) in a dose‐dependent manner. Compound 5f also exhibited in vitro anti‐survival (33% colony formation) and anti‐migratory effect (45% wound closure) on MCF‐7 cells upon treatment with sub‐IC50 dose. In vivo toxicological evaluation of compound 5f revealed excellent safety profile in mice at an oral dose of 2000 mg/kg BW. Our current study yielded a novel heterocyclic scaffold designed through systematic lead‐guided optimization displaying submicromolar SHP2 inhibitory activity. The lead molecule identified from in vitro studies was effective against the proliferation, survival and migration of human breast cancer cells with an excellent in vivo safety profile.
Promising Inhibitors of Endocannabinoid Degrading Enzymes Sharing a Carbamate Scaffold Shivani Jaiswal, Senthil Raja Ayyannan Mini Reviews in Medicinal Chemistry, 2025 Carbamate has been extensively used as a scaffold in the recent era of drug discovery and is a common structural motif of many approved drugs. The carbamate moiety's unique amide-ester hybrid (-O-CO-NH-) feature offers the designing of specific drug-target interactions. Despite the discovery of numerous carbamate derivatives that act on the endocannabinoid system (ECS), the development of clinically effective carbamates remains a challenge. In this review, we highlight the therapeutic potential of carbamate inhibitors of endocannabinoid degrading enzymes as a breakthrough in discovering neurotherapeutic drugs. We discuss the design strategies and medicinal chemistry aspects involved in developing carbamate-based molecular architectures that modulate the endocannabinoid signaling pathway by interfering with fatty acid amide hydrolase (FAAH), monoacylglycerol lipase (MAGL), and α/β-Hydrolase domain-containing 6 (ABHD6). Additionally, we highlight the dual activity profile of carbamates against FAAH and MAGL, FAAH and cholinesterase, and FAAH and TRPV1 channels. Furthermore, we illustrate the pharmacophores of O-functionalized carbamates and N-cyclic carbamates that are crucial for FAAH and MAGL inhibitory activities, respectively.
Identification of new small molecule allosteric SHP2 inhibitor through pharmacophore-based virtual screening, molecular docking, molecular dynamics simulation studies, synthesis and in vitro evaluation Rangan Mitra, Sandeep Kumar, Senthil Raja Ayyannan Journal of Biomolecular Structure and Dynamics, 2025 Src homology-2 (SH2) domain-containing phosphatase-2 (SHP2) is the first identified protooncogene and is a promising target for developing small molecule inhibitors as cancer chemotherapeutic agents. Pharmacophore-based virtual screening (PBVS) is a pharmacoinformatics methodology that employs physicochemical knowhow of the chemical space into the dynamic environs of computational technology to extract virtual molecular hits that are precise and promising for a drug target. In the current study, PBVS has been applied on EnamineTM Advanced Collection of 551,907 molecules by using a pharmacophore model developed upon SHP099 by Molecular Operating Environment (MOE) software to identify potential small molecule allosteric SHP2 inhibitors. Obtained 37 hits were further filtered through DruLiTo software for drug-likeness and PAINS remover which yielded 35 hits. These were subjected to molecular docking studies against the tunnel allosteric site of SHP2 (PDB ID: 5EHR) to screen them according to their binding affinity for the enzyme. Top 5 molecules having highest binding affinity for 5EHR were passed through an ADMET prediction screening and the top 2 hits (ligands 111675 and 546656) with the most favourable ADMET profile were taken for post screening molecular docking and MD simulation studies. From the protein-ligand interaction pattern, conformational stability and energy parameters, ligand 111675 (SHP2 Ki = 0.118 µM) resulted as the most active molecule. Further, the synthesis and in vitro evaluation of the lead compound 111675 unveiled its potent inhibitory activity (IC50 = 0.878 ± 0.008 µM) against SHP2.Communicated by Ramaswamy H. Sarma.
Antibacterial and antitubercular activities of some diphenyl hydrazones and semicarbazones Indian Journal of Chemistry Section B Organic and Medicinal Chemistry, 2010
Synthesis and antimicrobial evaluation of some 4- or 6-chloroisatin derivatives Indian Journal of Chemistry Section B Organic and Medicinal Chemistry, 2006
Synthesis of isatin semicarbazones as novel anticonvulsants - Role of hydrogen bonding Journal of Pharmacy and Pharmaceutical Sciences, 2002
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Design, synthesis, in vitro MAO‐B inhibitory evaluation, and computational studies of some 6‐nitrobenzothiazole‐derived semicarbazones RKP Tripathi, O Goshain, SR Ayyannan ChemMedChem 8 (3), 462-474 , 2013 2013 Citations: 53
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