Click chemistry technique led to novel 1,2,3-triazole-quinine conjugates 8a-g, 10a-o, 11a-h and 1... more Click chemistry technique led to novel 1,2,3-triazole-quinine conjugates 8a-g, 10a-o, 11a-h and 13 utilizing benzotriazole-mediated synthetic approach with excellent yields. Some of the synthesized analogs (11a, 11d-h) exhibited antimalarial properties against Plasmodium falciparum strain 3D7 with potency higher than that of quinine (standard reference used) through in vitro standard procedure bio-assay. Statistically significant BMLR-QSAR model describes the bio-properties, validates the observed biological observations and identifies the most important parameters governing bio-activity.
Alkaloids found in multiple species, known as ‘driver species’, are more likely to be included in... more Alkaloids found in multiple species, known as ‘driver species’, are more likely to be included in early-stage drug development due to their high biodiversity compared to rare alkaloids. Many synthetic approaches have been employed to hybridize the natural alkaloids in drug development. Click chemistry is a highly efficient and versatile reaction targeting specific areas, making it a valuable tool for creating complex natural products and diverse molecular structures. It has been used to create hybrid alkaloids that address their limitations and serve as potential drugs that mimic natural products. In this review, we highlight the recent advancements made in modifying alkaloids using click chemistry and their potential medicinal applications. We discuss the significance, current trends, and prospects of click chemistry in natural product-based medicine. Furthermore, we have employed computational methods to evaluate the ADMET properties and drug-like qualities of hybrid molecules.
Spirooxindoles occupy an important place in heterocyclic chemistry. Many natural spirooxindole-co... more Spirooxindoles occupy an important place in heterocyclic chemistry. Many natural spirooxindole-containing compounds have been identified as bio-promising agents. Synthetic analogs have also been synthesized utilizing different pathways. The present article summarizes the recent development of both natural and synthetic spirooxindole-containing compounds prepared from isatin or its derivatives reported in the last five years. The spirooxindoles are categorized based on their mentioned biological properties.
A simple, metal-free, cost-effective, and eco-friendly protocol for the preparation of trisubstit... more A simple, metal-free, cost-effective, and eco-friendly protocol for the preparation of trisubstituted 1,3,5 triazine from metformin using benzotriazole chemistry is reported. Short reaction time, large-scale synthesis, easy and quick isolation of the product, and excellent yield are the main advantages of this procedure. Furthermore, the use of benzotriazole chemistry results in a product free from metal traces. Our optimized reaction condition and methodology overcome the challenges of using a metal catalyst, such as a longer reaction time, lower yields, and expensive starting materials.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
At present therapeutic options for severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) a... more At present therapeutic options for severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) are very limited. We designed and synthesized three sets of small molecules using quinoline scaffolds. A series of quinoline conjugates (10a-l, 11a-c, and 12a-e) by incorporating 1,2,3-triazole were synthesized via a modified microwave-assisted click chemistry technique. Among the synthesized conjugates, 4-((1-(2-chlorophenyl)-1H-1,2,3-triazol-4-yl)methoxy)-6-fluoro-2-(trifluoromethyl)quinoline (10g) and 6-fluoro-4-(2-(1-(4-methoxyphenyl)-1H-1,2,3-triazol-4-yl)ethoxy)-2-(trifluoromethyl)quinoline (12c) show high potency against SARS-CoV-2. The selectivity index (SI) of compounds 10g and 12c also indicates the significant efficacy compared to the reference drugs.
Synthesis, pharmacological profile and 2D-QSAR studies of curcuminamino acid conjugates as potent... more Synthesis, pharmacological profile and 2D-QSAR studies of curcuminamino acid conjugates as potential drug candidates,
A series of new fluoroquinolone conjugates 8a-g and 9a-f were synthesized via benzotriazole-media... more A series of new fluoroquinolone conjugates 8a-g and 9a-f were synthesized via benzotriazole-mediated synthetic approach with good yield and purity. Some of the synthesized analogs exhibited significant antibacterial properties against E. coli and S. aureus with potency higher than that of the parent drugs through in vitro standard bio-assay procedure (conjugates 8c and 8d reveal antimicrobial properties with potency 1.9, 61.9, 20.7 and 2.4, 37.1, 8.3 folds relative to the parent antibiotic 6 against E. coli, S. aureus and E. faecalis, respectively). The observed experimental data supported by enzymatic DNA gyrase inhibitory property. Developed BMLR-QSAR model validates the observed experimental data and recognizes the parameters responsible for the enhanced antibacterial properties.
Aporosa octandra (Buch.-Ham. ex D.Don) Vickery is a native species of India. Different parts of t... more Aporosa octandra (Buch.-Ham. ex D.Don) Vickery is a native species of India. Different parts of the plant are used for the medicinal purpose by the tribal peoples of southeastern part of India. However, the biological properties of A. octandra have not been studied well. The extracts obtained from the bark of A. octandra were evaluated to determine their protective effect on cognitive impairment and oxidative stress in mice induced by D-galactose using the standard protocol. Different dosages of extract AOE-4 (100, 200, and 300 mg/ kg, p.o.) were administered to mice, which were previously treated for six weeks with D-galactose (100 mg/kg s.c.). The D-galactose-induced mice showed significantly impaired cognitive behavior, i.e., oxidative defense, compared to the
The spirooxindole heterocyclic scaffold is found in many natural products and has been identified... more The spirooxindole heterocyclic scaffold is found in many natural products and has been identified as an important bioactive agent. Over the past few decades, various spirooxindole-containing compounds have been reported to possess biological properties and hence found in the structure of many synthetic pharmaceuticals. This mini-review describes the most promising examples of this class of compounds possessing biological activity including anticancer, anti-inflammatory, and antimicrobial activities. The current review focuses on the biological activity of compounds containing the spirooxindole scaffold.
Bronchodilatory active nicotinonitrile containing-compounds were synthesized and molecular modeli... more Bronchodilatory active nicotinonitrile containing-compounds were synthesized and molecular modeling studies were reported.
Abstract The utility of 1 H -benzotriazole as a halogen surrogate in acylation, aroylation, and a... more Abstract The utility of 1 H -benzotriazole as a halogen surrogate in acylation, aroylation, and alkylation reactions is reviewed together with its application to the synthesis of heterocycles, peptides, isopeptides, cyclic peptides, peptidomimetics, and peptide conjugates.
Bioorganic & medicinal chemistry letters, Jan 15, 2015
Novel, quinolone-fluoroquinolone conjugates 10a-f, 11a-f, 13a-f and 14a-f with amino acid linkers... more Novel, quinolone-fluoroquinolone conjugates 10a-f, 11a-f, 13a-f and 14a-f with amino acid linkers were synthesized in good yields utilizing benzotriazole chemistry. Antibacterial bioassay showed the synthesized bis-conjugates exhibit anti-bacterial properties comparable with the parent drugs.
Phosphorus, Sulfur, and Silicon and the Related Elements, 2011
A highly efficient synthesis of some novel symmetrical bis spiro-indoles has been achieved by cyc... more A highly efficient synthesis of some novel symmetrical bis spiro-indoles has been achieved by cyclocondensation of hitherto unknown bis Schiff's bases with mercaptoacetic acid in water. The structures of the new compounds have been deduced by elemental analysis and spectral data.
Benzotriazole-mediated syntheses of novel bioconjugates of nonsteroidal anti-inflammatory drugs w... more Benzotriazole-mediated syntheses of novel bioconjugates of nonsteroidal anti-inflammatory drugs with carnosine and with amino acids were prepared in yields of 50–97% as potential drug candidates.
Bacterial DNA gyrase is a type II topoisomerase that can introduce negative supercoils to DNA sub... more Bacterial DNA gyrase is a type II topoisomerase that can introduce negative supercoils to DNA substrates and is a clinically-relevant target for the development of new antibacterials. DNA gyrase is one of the primary targets of quinolones, broad-spectrum antibacterial agents and are used as a first-line drug for various types of infections. However, currently used quinolones are becoming less effective due to drug resistance. Common resistance comes in the form of mutation in enzyme targets, with this type being the most clinically relevant. Additional mechanisms, conducive to quinolone resistance, are arbitrated by chromosomal mutations and/or plasmid-gene uptake that can alter quinolone cellular concentration and interaction with the target, or affect drug metabolism. Significant synthetic strategies have been employed to modify the quinolone scaffold and/or develop novel quinolones to overcome the resistance problem. This review discusses the development of quinolone antibiotics ...
Click chemistry technique led to novel 1,2,3-triazole-quinine conjugates 8a-g, 10a-o, 11a-h and 1... more Click chemistry technique led to novel 1,2,3-triazole-quinine conjugates 8a-g, 10a-o, 11a-h and 13 utilizing benzotriazole-mediated synthetic approach with excellent yields. Some of the synthesized analogs (11a, 11d-h) exhibited antimalarial properties against Plasmodium falciparum strain 3D7 with potency higher than that of quinine (standard reference used) through in vitro standard procedure bio-assay. Statistically significant BMLR-QSAR model describes the bio-properties, validates the observed biological observations and identifies the most important parameters governing bio-activity.
Alkaloids found in multiple species, known as ‘driver species’, are more likely to be included in... more Alkaloids found in multiple species, known as ‘driver species’, are more likely to be included in early-stage drug development due to their high biodiversity compared to rare alkaloids. Many synthetic approaches have been employed to hybridize the natural alkaloids in drug development. Click chemistry is a highly efficient and versatile reaction targeting specific areas, making it a valuable tool for creating complex natural products and diverse molecular structures. It has been used to create hybrid alkaloids that address their limitations and serve as potential drugs that mimic natural products. In this review, we highlight the recent advancements made in modifying alkaloids using click chemistry and their potential medicinal applications. We discuss the significance, current trends, and prospects of click chemistry in natural product-based medicine. Furthermore, we have employed computational methods to evaluate the ADMET properties and drug-like qualities of hybrid molecules.
Spirooxindoles occupy an important place in heterocyclic chemistry. Many natural spirooxindole-co... more Spirooxindoles occupy an important place in heterocyclic chemistry. Many natural spirooxindole-containing compounds have been identified as bio-promising agents. Synthetic analogs have also been synthesized utilizing different pathways. The present article summarizes the recent development of both natural and synthetic spirooxindole-containing compounds prepared from isatin or its derivatives reported in the last five years. The spirooxindoles are categorized based on their mentioned biological properties.
A simple, metal-free, cost-effective, and eco-friendly protocol for the preparation of trisubstit... more A simple, metal-free, cost-effective, and eco-friendly protocol for the preparation of trisubstituted 1,3,5 triazine from metformin using benzotriazole chemistry is reported. Short reaction time, large-scale synthesis, easy and quick isolation of the product, and excellent yield are the main advantages of this procedure. Furthermore, the use of benzotriazole chemistry results in a product free from metal traces. Our optimized reaction condition and methodology overcome the challenges of using a metal catalyst, such as a longer reaction time, lower yields, and expensive starting materials.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
At present therapeutic options for severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) a... more At present therapeutic options for severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) are very limited. We designed and synthesized three sets of small molecules using quinoline scaffolds. A series of quinoline conjugates (10a-l, 11a-c, and 12a-e) by incorporating 1,2,3-triazole were synthesized via a modified microwave-assisted click chemistry technique. Among the synthesized conjugates, 4-((1-(2-chlorophenyl)-1H-1,2,3-triazol-4-yl)methoxy)-6-fluoro-2-(trifluoromethyl)quinoline (10g) and 6-fluoro-4-(2-(1-(4-methoxyphenyl)-1H-1,2,3-triazol-4-yl)ethoxy)-2-(trifluoromethyl)quinoline (12c) show high potency against SARS-CoV-2. The selectivity index (SI) of compounds 10g and 12c also indicates the significant efficacy compared to the reference drugs.
Synthesis, pharmacological profile and 2D-QSAR studies of curcuminamino acid conjugates as potent... more Synthesis, pharmacological profile and 2D-QSAR studies of curcuminamino acid conjugates as potential drug candidates,
A series of new fluoroquinolone conjugates 8a-g and 9a-f were synthesized via benzotriazole-media... more A series of new fluoroquinolone conjugates 8a-g and 9a-f were synthesized via benzotriazole-mediated synthetic approach with good yield and purity. Some of the synthesized analogs exhibited significant antibacterial properties against E. coli and S. aureus with potency higher than that of the parent drugs through in vitro standard bio-assay procedure (conjugates 8c and 8d reveal antimicrobial properties with potency 1.9, 61.9, 20.7 and 2.4, 37.1, 8.3 folds relative to the parent antibiotic 6 against E. coli, S. aureus and E. faecalis, respectively). The observed experimental data supported by enzymatic DNA gyrase inhibitory property. Developed BMLR-QSAR model validates the observed experimental data and recognizes the parameters responsible for the enhanced antibacterial properties.
Aporosa octandra (Buch.-Ham. ex D.Don) Vickery is a native species of India. Different parts of t... more Aporosa octandra (Buch.-Ham. ex D.Don) Vickery is a native species of India. Different parts of the plant are used for the medicinal purpose by the tribal peoples of southeastern part of India. However, the biological properties of A. octandra have not been studied well. The extracts obtained from the bark of A. octandra were evaluated to determine their protective effect on cognitive impairment and oxidative stress in mice induced by D-galactose using the standard protocol. Different dosages of extract AOE-4 (100, 200, and 300 mg/ kg, p.o.) were administered to mice, which were previously treated for six weeks with D-galactose (100 mg/kg s.c.). The D-galactose-induced mice showed significantly impaired cognitive behavior, i.e., oxidative defense, compared to the
The spirooxindole heterocyclic scaffold is found in many natural products and has been identified... more The spirooxindole heterocyclic scaffold is found in many natural products and has been identified as an important bioactive agent. Over the past few decades, various spirooxindole-containing compounds have been reported to possess biological properties and hence found in the structure of many synthetic pharmaceuticals. This mini-review describes the most promising examples of this class of compounds possessing biological activity including anticancer, anti-inflammatory, and antimicrobial activities. The current review focuses on the biological activity of compounds containing the spirooxindole scaffold.
Bronchodilatory active nicotinonitrile containing-compounds were synthesized and molecular modeli... more Bronchodilatory active nicotinonitrile containing-compounds were synthesized and molecular modeling studies were reported.
Abstract The utility of 1 H -benzotriazole as a halogen surrogate in acylation, aroylation, and a... more Abstract The utility of 1 H -benzotriazole as a halogen surrogate in acylation, aroylation, and alkylation reactions is reviewed together with its application to the synthesis of heterocycles, peptides, isopeptides, cyclic peptides, peptidomimetics, and peptide conjugates.
Bioorganic & medicinal chemistry letters, Jan 15, 2015
Novel, quinolone-fluoroquinolone conjugates 10a-f, 11a-f, 13a-f and 14a-f with amino acid linkers... more Novel, quinolone-fluoroquinolone conjugates 10a-f, 11a-f, 13a-f and 14a-f with amino acid linkers were synthesized in good yields utilizing benzotriazole chemistry. Antibacterial bioassay showed the synthesized bis-conjugates exhibit anti-bacterial properties comparable with the parent drugs.
Phosphorus, Sulfur, and Silicon and the Related Elements, 2011
A highly efficient synthesis of some novel symmetrical bis spiro-indoles has been achieved by cyc... more A highly efficient synthesis of some novel symmetrical bis spiro-indoles has been achieved by cyclocondensation of hitherto unknown bis Schiff's bases with mercaptoacetic acid in water. The structures of the new compounds have been deduced by elemental analysis and spectral data.
Benzotriazole-mediated syntheses of novel bioconjugates of nonsteroidal anti-inflammatory drugs w... more Benzotriazole-mediated syntheses of novel bioconjugates of nonsteroidal anti-inflammatory drugs with carnosine and with amino acids were prepared in yields of 50–97% as potential drug candidates.
Bacterial DNA gyrase is a type II topoisomerase that can introduce negative supercoils to DNA sub... more Bacterial DNA gyrase is a type II topoisomerase that can introduce negative supercoils to DNA substrates and is a clinically-relevant target for the development of new antibacterials. DNA gyrase is one of the primary targets of quinolones, broad-spectrum antibacterial agents and are used as a first-line drug for various types of infections. However, currently used quinolones are becoming less effective due to drug resistance. Common resistance comes in the form of mutation in enzyme targets, with this type being the most clinically relevant. Additional mechanisms, conducive to quinolone resistance, are arbitrated by chromosomal mutations and/or plasmid-gene uptake that can alter quinolone cellular concentration and interaction with the target, or affect drug metabolism. Significant synthetic strategies have been employed to modify the quinolone scaffold and/or develop novel quinolones to overcome the resistance problem. This review discusses the development of quinolone antibiotics ...
Uploads
Papers by Siva S Panda