• Ph.D in Organic Chemistry awarded in July,2014, from Sri Venkateswara University, Tirupathi, India
• M.Phil in Organic Chemistry with Ist Class from Annamalai University, Guntur, India, March, 2009.
• M.Sc in Organic Chemistry with Ist Class from Acharya Nagarjuna University, Guntur, India, From 2002-2004.
• B.Sc in M.P.C with Ist Class from Acharya Nagarjuna University, Guntur, India, From 1998-2001.
RESEARCH, TEACHING, or OTHER INTERESTS
Chemistry, Multidisciplinary, Organic Chemistry, Drug Discovery
Green synthesis, ADME and docking studies, and in vitro assessment of chromone-based α-aminophosphonates as dual inhibitors of α-amylase and α-glucosidase Bhuvaneswari Chalapaka, Subramanyam Chennamsetty, Gladis Raja Malar C., Bharath Pannuri, S. V. G. Bhavani Nariboina, S. N. Murthy Boddapati, Angeline Jyothirmayee Chikkala Synthetic Communications, 2026 A novel series of chromone-based α-aminophosphonates (7a–j) as potential dual inhibitors of α-amylase and α-glucosidase were developed and synthesized using a solvent-free, ultrasonic-assisted Kabachnik-Fields reaction catalyzed by nano-ZnO, with high yields. Before synthesis, molecular docking simulations and in silico ADMET evaluation were used to estimate the pharmacokinetic properties and inhibitory interactions with α-amylase and α-glucosidase enzymes. Spectroscopy was utilized to determine structural integrity. The compounds were tested in vitro for inhibitory effects on two enzymes linked to type 2 diabetes. When compared to acarbose, the in silico ADME analysis showed favorable pharmacokinetic characteristics suggesting promising oral drug-likeness. Stronger binding affinities were found in molecular docking studies toward pancreatic α-amylase and α-glucosidase than acarbose. Compounds 7e, 7d, and 7i inhibited α-amylase and α-glucosidase with IC50 values comparable to or better than acarbose, suggesting their promise as scaffolds for anti-diabetic drug development.
Nano-ZnO catalyzed microwave synthesis of novel αaminophosphonates: anti-diabetic potential via molecular docking, ADMET analysis, and α-amylase and α-glucosidase inhibition studies Madhava Rao Vallabhaneni, Hanumatha Rao Addanki, Ch. Subramanyam, K. Venkata Ramana, C. Gladis Raja Malar, G.R. Satyanarayana Organic Communications, 2025 A more efficient and environmentally friendly approach has been developed for synthesizing aminophosphonates through the Kabachnik-Fields (K-F), catalyzed by nano-ZnO in a solvent-free environment, utilizing microwave irradiation.Before synthesis, each compound underwent in silico ADMET analysis and molecular docking to assess drug-like characteristics and their potential to inhibit -amylase.The structure of the newly synthesized compounds was validated using spectroscopic analysis, and their in vitro inhibitory effects on -amylase and -glucosidase were assessed.Among the compounds 8g (IC50, 99.20.5 g/mL), 8i (IC50, 101.20.3 g/mL), 8e (IC50, 102.10.4 g/mL) and 8j (IC50, 103.40.4 g/mL) containing anthracen-9-ylamino, phenanthren-9-ylamino, 2-oxo-2H-chromen-6-yl)amino and 2benzoylphenyl)amino moieties respectively, exhibited the highest inhibitory activity on -amylase, superior to the reference compound acarbose (IC50, 104.50.1 g/mL).The remaining compounds demonstrated moderate to good enzyme inhibition.8c bearing with 4-fluorophenyl substituent (IC50, 88.40.7 g/mL), 8e (IC50, 90.00.4g/mL) bearing with 2-oxo-2H-chromen-6-yl substituent and 8d (IC50, 91.10.9 g/mL) bearing with 2-methylbenzo[d]oxazol-5-yl moiety have shown the highest inhibitory activity on -glucosidase than the reference drug, Acarbose ((IC50, 93.10.8 g/mL).The remaining compounds exhibited moderate to good inhibition on the enzyme with IC50 ranging 94.50.9 to 141.40.7 g/mL.
Microwave-driven synthesis of α-aminophosphonates targeting diabetes: in silico and in vitro assessment of α-amylase and α-glucosidase inhibition Manjula K., Raja Rajeswari T., Ch. Subramanyam Synthetic Communications, 2025 A new library of α-aminophosphonate derivatives (9a–j) was developed utilizing a Kabachnik–Fields multicomponent method with microwave assistance. Prior to synthesis, their pharmacokinetic characteristics and inhibitory interactions with the enzymes α-amylase and α-glucosidase were predicted using molecular docking simulations and in silico ADMET evaluation. Spectroscopy was used to check the structural integrity. The synthesized compounds were examined in vitro for inhibitory effects against two enzymes associated with type 2 diabetes. Compound 9e inhibited α-glucosidase the most (IC50 = 88.89 μg/mL), while compound 9b inhibited both enzymes (IC50 = 2.6 μg/mL for α-glucosidase and 102.36 μg/mL for α-amylase), similar to acarbose. SAR analysis found that electron-donating and heterocyclic groups increased activity, whereas bulky or electron-withdrawing substituents reduced efficacy. Statistical validation with ANOVA and Tukey’s HSD test revealed significant variations in enzyme inhibition across the compound set. These findings suggest that the synthesized compounds serve as promising candidates for the development of dual-action anti-diabetic agents.
Synthesis of novel chromenyl phosphonates via nano-ZnO-catalyzed microwave method: Exploring potential anti-diabetic agents through molecular docking, ADMET analysis, and α-amylase inhibition Manjula Kavala, Raja Rajeswari Tiruveedula, Subramanyam Chennamsetty Synthetic Communications, 2024 A more efficient and environmentally friendly approach has been developed for synthesizing phosphonates through the Michaelis-Arbuzov reaction, catalyzed by nano-ZnO in a solvent-free environment, utilizing microwave irradiation. Before synthesis, each compound underwent in silico ADMET analysis and molecular docking to assess drug-like characteristics and their potential to inhibit α-amylase. The structure of the newly synthesized compounds was validated using spectroscopic analysis, and their in vitro inhibitory effects on α-amylase were assessed. Among the compounds, dimethyl 2-(anthracen-10-yl)-4-oxo-4H-chromen-6-yl-6-phosphonate (6j), dimethyl 2-(naphthalen-1-yl)-4-oxo-4H-chromen-6-yl-6-phosphonate (6h), and dimethyl 2-(1-methyl-1H-indol-3-yl)-4-oxo-4H-chromen-6-yl-6-phosphonate (6e) displayed the highest inhibitory activity compared to the reference substance, acarbose. Additionally, compounds dimethyl 2-(benzo[d][1,3]dioxol-4-yl)-4-oxo-4H-chromen-6-yl-6-phosphonate (6i), dimethyl 4-oxo-2-phenyl-4H-chromen-6-yl-6-phosphonate (6a), and dimethyl 2-(1H-indol-5-yl)-4-oxo-4H-chromen-6-yl-6-phosphonate (6g) exhibited nearly equivalent effective inhibitory activity when compared to the standard. The remaining compounds demonstrated moderate to good enzyme inhibition.
Ultrasound-assisted synthesis of α-aminophosphonates using nano ZnO catalyst: evaluation of their anti-diabetic activity Kammela Prasada Rao, Chennamsetty Subramanyam, Meson Haji Basha, Mohan Seelam, Katare Kiran Kumar, Vedula Naga Lakshmi, C. Gladis Raja Malar Organic Communications, 2024 A more efficient and environmentally friendly way of synthesizing -aminophosphonates is achieved by employing nano-ZnO to catalyze the Kabachnik-Fields reaction under ultrasonication within a solvent-free environment.Before synthesis, molecular docking and in silico ADME analysis were used to assess each molecule's drug-like characteristics and ability to inhibit -amylase and -glucosidase.The newly synthesized compounds' in vitro inhibitory effects on -amylase and -glucosidase were also evaluated, and their structure was confirmed using spectroscopic investigation.The target enzyme was effectively inhibited by most of the substances.In comparison to the reference drug, acarbose (IC50, 106.50.6 g/mL), compounds 4d (IC50, 102.20.3 g/mL), 4h (IC50, 102.90.4 g/mL), which contained a 2H-1,3-benzodioxol-5-yl moiety, and 4i (IC50, 103.90.5 g/mL) showed the strongest inhibitory activity.The enzyme inhibition of the remaining compounds ranged from moderate to good.
In silico molecular docking study and nano TiO2-SiO2 catalyzed microwave facilitated synthesis of new bis(α-aminophosphonates) as potential anti-diabetic agents Mahankali Pavan Phani Kumar, Anuradha Vejendla, C. Gladis Raja Malar, Subramanyam Chennamsetty, Subrahmanyam Talari, Nagalakshmi Vedula Phosphorus Sulfur and Silicon and the Related Elements, 2023 AbstractIn the present work, we have developed a greener approach to synthesize a series of novel bis(α-aminophosphonates) (bis(α-Aps)) via a microwave-mediated nano TiO2-SiO2 catalyzed Kabachnik-Fields (K-F) reaction under solvent-free conditions. An in silico molecular docking analysis was performed on all the designed molecules prior to their synthesis to get insight into their capacity to block the enzymes, α-amylase (PDB ID:3IJ8) and α-glucosidase (PDB ID:1OBB). The molecules with significant binding affinity were synthesized and spectroscopically analyzed to confirm their structure. They were screened further in vitro for their inhibitory activity on the target enzymes. When compared with the reference drug, the compounds diethyl[(2H‐1,3‐benzodioxol‐5‐yl)[(6‐{[(2H‐1,3‐benzodioxol‐5‐yl)(diethoxyphosphoryl)-methyl]amino}‐10,10‐dioxo‐9H‐10λ6‐thioxanthen‐3‐yl)amino]-methyl]phosphonate (4h), diethyl [(anthracen-9-yl)[(6-{[(anthracen-9-yl)(diethoxyphosphoryl)methyl]amino}-10,10-dioxo-9H-10λ6-thioxanthen-3-yl)amino]-methyl]phosphonate (4i) have shown greater inhibition, and diethyl{[(6‐{[(diethoxyphosphoryl)(phenyl)methyl]amino}‐10,10‐dioxo‐9H‐10λ6‐thioxanthen‐3‐yl)amino](phenyl)methyl}phosphonate (4a), diethyl {[(6-{[(diethoxyphosphoryl)(4-hydroxy-3-nitrophenyl)methyl]amino}-10,10-dioxo-9H-10λ6-thioxanthen-3-yl)amino](4-hydroxy-3-nitrophenyl)methyl}phosphonate (4e) have shown equal inhibition against the α-amylase enzyme. Compounds diethyl{[(6‐{[(diethoxyphosphoryl)(phenyl)methyl]amino}‐10,10‐dioxo‐9H‐10λ6‐thioxanthen‐3‐yl)-amino](phenyl)methyl}phosphonate (4a), diethyl[(2H‐1,3‐benzodioxol‐5‐yl)[(6‐{[(2H‐1,3‐benzodioxol‐5‐yl)(diethoxyphosphoryl)methyl]amino}‐10,10‐dioxo‐9H‐10λ6‐thioxanthen‐3‐yl)amino]methyl]phosphonate (4h), and diethyl [(anthracen-9-yl)[(6-{[(anthracen-9-yl)(diethoxyphosphoryl)methyl]amino}-10,10-dioxo-9H-10λ6-thioxanthen-3-yl)amino]-methyl]phosphonate (4i) have shown superior inhibition and diethyl{[(6‐{[(diethoxyphosphoryl)(naphthalen‐1‐yl)methyl]amino}‐10,10‐dioxo‐9H‐10λ6‐thioxanthen‐3‐yl)amino](naphthalen‐1‐yl)methyl}phosphonate (4 g) has shown equal inhibition against the α-glucosidase enzyme. All the remaining compounds displayed modest to good inhibition when compared with the reference drug, Acarbose.Keywords: Bis(α-aminophosphonates)nano TiO2.SiO2microwaveKabachnik-Fields reactionα-amylaseα-glucosidase enzyme AcknowledgmentsAuthors acknowledge Dr. S. Someswar Rao, Department of Genitics, Osmania University for his support in bioactivity studies and Dr. C. Naga Raju, Department of Chemistry, S. V. University, Tirupati for his constant support to complete this work.Disclosure statementNo potential conflict of interest was reported by the authors.
Ultrasound mediated nano ZnO catalyzed synthesis of new α-aminophosphonates as potential anti-diabetic agents; an in silico ADMET, molecular docking study, α-amylase and α-glucosidase inhibitory activity CH. Subramanyam, K. Kiran Kumar, K. Venkata Ramana, C. Gladis Raja Malar, S. Mohan, V Nagalakshmi Synthetic Communications, 2023 A more efficient and ecologically friendly method has been devised for the preparation of α-amino phosphonates by Kabachnik-Fields (K-F) reaction in a solvent-free environment using an ultrasonication technique catalyzed by nano ZnO. Primarily, an in silico ADMET and molecular docking analysis was carried out on each molecule prior to synthesis to get insight into drug-likeliness behavior and their capacity to inhibit α-amylase and α-glucosidase. The structure of the newly synthesized compounds was confirmed using spectroscopic analysis, and each one’s in vitro inhibitory action against α-amylase and α-glucosidase was evaluated. The compounds diethyl (4-(4-oxo-4H-chromen-2-yl)phenylamino)(4-hydroxy-3-nitrophenyl)methylphosphonate (7e) and diethyl (4-(4-oxo-4H-chromen-2-yl)phenylamino)(benzo[d][1,3]dioxol-6-yl)methylphosphonate (7h) exhibited the highest inhibitory activity against α-amylase in comparison to the reference substance acarbose. The compounds diethyl (4-(4-oxo-4H-chromen-2-yl)phenylamino)(4-fluorophenyl)methylphosphonate (7d), diethyl (4-(4-oxo-4H-chromen-2-yl)phenylamino)(3-(trifluoromethyl)phenyl)methylphosphonate (7 g) and diethyl (4-(4-oxo-4H-chromen-2-yl)phenylamino)(benzo[d][1,3]dioxol-6-yl)methylphosphonate (7h) have shown the highest inhibitory activity against α-glucosidase than the reference drug, Acarbose. The remaining compounds have shown equipotent to good inhibitory activity against both the tested enzymes. Graphical Abstract
Synthesis and anti-microbial activity evaluation of phosphorylated urea/thio-urea derivatives Der Pharmacia Lettre, 2012
RECENT SCHOLAR PUBLICATIONS
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Nano-ZnO catalyzed microwave synthesis of novel α-aminophosphonates: anti-diabetic potential via molecular docking, ADMET analysis, and α-amylase and α-glucosidase inhibition … HR Addanki, C Subramanyam, KV Ramana, CGR Malar, ... Organic Communications 18 (2), 82 , 2025 2025 Citations: 2
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Ultrasound mediated nano ZnO catalyzed synthesis of new α -aminophosphonates as potential anti-diabetic agents; an in silico ADMET, molecular docking study, α -amylase … CH Subramanyam, K Kiran Kumar, K Venkata Ramana, ... Synthetic Communications 53 (23), 2041-2060 , 2023 2023 Citations: 8
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In silico molecular docking study and nano TiO2-SiO2 catalyzed microwave facilitated synthesis of new bis (a-aminophosphonates) as potential anti-diabetic agents MPP Kumar, A Vejendla, C Malar, G Raja, S Chennamsetty, S Talari, ... PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS , 2023 2023 Citations: 7
2-(Benzo [d] thiazol-2-yl) phenyl-4-nitrophenyl alkyl/aryl substituted phosphoramidates: Synthesis, characterization and antimicrobial activity evaluation SM Reddy, DS Rao, K Madhu, C Subramanyam, PG Kumari, CN Raju Phosphorus, Sulfur, and Silicon and the Related Elements 193 (3), 136-140 , 2018 2018 Citations: 6
