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Herein, an efficient and scalable synthesis of 2,4-diaryl substituted chromene [43-b] pyridine derivatives, using a multicomponent reaction strategy by microwave irradiation of 4-amino 2-oxo- 2H-chromene, aromatic aldehydes, and substituted anilines is described. This synthetic strategy was found to be very useful as it follows environment benign protocol. Also it gives a good outcome in terms of yield and requires a shorter reaction time.

Background:An enantiomeric separation of the stability-indicating high-performance liquid chromatographic method was developed and validated for the analysis of Meclizine enantiomers. The degradation behavior of Meclizine Hydrochloride was investigated under different stress conditions recommended by the International Conference on Harmonization (ICH). Methods:Enantiomeric resolution of the drug and complete separation from its degradation products were successfully achieved on a Phenomenex® lux cellulose 1 C18 (250 mm × 4.6 mm i.d, 5 μm particle size) column, using UV detector at a wavelength of 230 nm, with a mobile phase consisting of acetonitrile, 20mM ammonium bicarbonate at the ratio of 75:25 (v/v), and a flow rate of 1 mL/min. The drug was subjected to alkaline, acidic, neutral, oxidative and photolytic conditions in order to mimic stress conditions. Result:The degradation products were well resolved from main peak and proving the stability-indicating power of the method. The developed method provided linear responses within the concentration range 1-5 µg/mL, and regression analysis showed a correlation coefficient value (r2) of 0.999. The HPLC method was validated as per ICH guidelines with respect to specificity, precision, linearity and robustness. Limit of detection (LOD) and limit of quantification (LOQ) were found to be 0.25 µg/mL and 1.00 µg/mL respectively. Conclusion: The method provides good sensitivity and excellent precision and reproducibility. The method was highly selective, where degradation products and co formulated compounds did not interfere. The proposed method was successfully applied in pharmaceutical preparations.

A large analysis of the signal transducer and activator of transcription (STAT3) in cancer is currently being carried out. It regulates gene expression, which is required for normal cellular functi...

Background: A series of new zerumbone hydrazones 5a-f and 9a-f have been synthesized in via an in situ procedure in high yields. The structure of synthesized compounds has been confirmed using 1H, 13C NMR and HR-MS. The bioassay result showed that several compounds exhibited cytotoxic effects against three human cancer cell lines, including HepG-2, SK-LU-1, and MCF-7. Compound 9a showed the best cytotoxic effect against HepG-2, SK-LU-1, and MCF-7 with IC50 values of 8.20, 6.66, and 9.35 μM, respectively. Objective: This study aims at developing new zerumbone hydrazones as anticancer agents based on zerumbone, a natural compound wildly growing in Vietnam. Methods: A series of new zerumbone hydrazones was designed, synthesized, and evaluated for cytotoxicity against three human cancer cell lines, including HepG-2, MCF-7, and SKLu-1, using the MTT method. Results: The bioassay result showed that several compounds exhibited cytotoxic effects against three human cancer cell lines, including HepG-2, SK-LU-1, and MCF-7. Especially, compound 9a displayed the best cytotoxic effect against HepG-2, SK-LU-1, and MCF-7 with IC50 values of 8.20, 6.66, and 9.35 μM, respectively. Conclusion: The research results suggest that some compounds could be considered as leads for the future design of zerumbone hydrazones in which bio-isosteric replacements in theortho position of the phenyl ring could be performed to improve the cytotoxic activity.

Enantiomeric resolution of the drug and complete separation from its degradation products was successfully achieved on a PAK IG-3 (150 × 4.6 mm i.d., 3 µm particle size) column, using UV detector at a wavelength of 290 nm, with mobile phase consisting of acetonitrile, 20 mM ammonium bicarbonate at the ratio of 95:05 (v/v), and a flow rate of 0.7 mL/min. In order to subjected to stress conditions, the drug has been exposed to alkaline, acidic, neutral, oxidative, and photolytic conditions. The products of degradation were well resolved from the main peak and proved the method's stability-indicating method. The method linear ranged between 10-110 μg/mL and 5-100 μg/mL for (+) and (-) midodrine enantiomers and regression analysis showed a correlation coefficient value (

Herbal plants have been used to avert and to heal numerous ailments for thousands of years. There are reputable sources of active components using their health beneficial effects, and repeatedly, these sources are materials for gourmet food feastings. Specific bioactive components from the herbs have been established for their anti-neoplastic activities. The herbal plant Pedalium murex Linn (Family: Pedaliaceae) universally known to the world as “Large Caltrops”. The plant is rich in flavonoids, phenolics and glycosides. The key target of the contemporary research was to explore the free radical scavenging, in vitro anti-tumour potential of Pedalium murex Linn leaves in non-polar petroleum ether & polar ethanol solvent extracts. Preliminary phytochemical examination of extracts showed that this plant leaf contains alkaloids, flavonoids, glycosides, saponins, steroids & tannins. This initial investigation proved that Pedalium murex Linn (95% v/v of ethanol extract) leaves (EEPM) were significantly reduced and inhibit the free radicals. IC 50 values were representing, EEPM possessed strong anti-oxidant activity when compared to petroleum ether extract of Pedalium murex Linn. leaves. In vitro anti-neoplastic activity of EEPM was studied on the two different cancer cell lines such as HCT116, HepG2 by MTT assay method. All the four different doses of EEPM (62.5, 125, 250 & 500 µg/ml) produced significant activity against HepG2 cell lines. It shows that phyto lead molecules such as flavonoids & phenolic compounds existing in the EEPM may be accountable for the anti-cancer activities.

Background: In the year earlier part of 2020, many scientists urged to discover novel drugs against for the treatments of COVID-19. Coronavirus Disease 2019 (COVID-19), a life-threatening viral disease, was discovered first in China and quickly spread throughout the world. Objective: In the present article, some novel chalcone substituted 9-anilinoacridines (1a-z) were developed by in silico studies for their COVID19 inhibitory activity. Molecular docking studies of the ligands 1a-z were performed against COVID19 (PDB id - 5R82) targeting the coronavirus using Schrodinger suite 2019-4. Methods: The molecular docking studies were performed by the Glide module and the binding energy of ligands was calculated using the PRIME MM-GB/SA module of Schrodinger suite 2019-4. Results: From the results, many compounds are significantly active against COVID19 with a Glide score of more than -5.6 when compared to the currently used drug for the treatment of COVID19, Hydroxychloroquine (-5.47). The docking results of the compounds exhibited similar mode of interactions with COVID19 and the residues, THR25, THR26, LEU27, SER46, MET49, HIE41, GLN189, ARG188, ASP187, VAL186, HIE164, ASN142, and GLY143 play a crucial role in binding with ligands. MMGBSA binding calculations of the most potent inhibitors are more stably favourable. Conclusion: From the results of in-silico studies, it provides strong evidence for the consideration of valuable ligands in chalcone substituted 9-anilinoacridines as potential COVID19 inhibitors and the compounds, 1x,a,r,s with significant Glide scores may produce significant COVID19 activity for further development, which may prove their therapeutic potential.

Coronavirus Disease 2019 (COVID-19), a life-threatening viral disease affected first in Wuhan, China, and quickly spread to more than 200 countries in the world in the year 2020 So many scientists are trying to discover novel drugs and vaccines for coronavirus and treatment for COVID-19 In the present arti-cle, in-silico studies have been performed to explore the binding modes of Thiazine substituted 9-anilinoacridines (1a-z) against SARS CoV 2 main protease (PDB id-5R82) targeting the coronavirus using Schrodinger suit 2019-4 The molecular docking studies are performed by Glide module, in-silico ADMET screening was performed by Qik prop module, and the binding free energy of ligands was calculated using PRIME MM-GB/SA module of Schrodinger suite 2019-4, Maestro 21 2 version From the in-silico results, Thiazine substituted 9-anilinoacridines like 1m, 1j, 1s and 1b are significantly active against SARS CoV 2 main protease with Glide score more than-5 4 when compared with the currently recommended drug for COVID19, Hydroxychloroquine (G score-5 47) The docking results of the Thiazine substituted 9-anilinoacridines exhibited similar mode of interactions with COVID19 and the residues GLN19, THR24, THR25, THR26, LEU27, HIE41, SER46, MET49, ASN142, GLN143, HIE164, MET165, ASP187, ARG188 and GLN189, play a crucial role in binding with ligands © International Journal of Research in Pharmaceutical Sciences

An enantiomeric separation of meclizine enantiomers by liquid chromatography with tandem mass spectrometry LC-MS method was developed and validated for the analysis of Meclizine enantiomers. Enantiomeric resolution of the drug products were successfully achieved on a Phenomenex® lux cellulose 1 C18 (250 mm × 4.6 mm i.d, 5 µm particle size) column with mobile phase consisting of acetonitrile: 5 mM ammonium format pH (5.5) adjusted with formic acid (90:10) (v/v), and a flow rate of 0.4 mL/min. The developed method provided linear responses within the concentration range 1-5 ng/mL, and regression analysis showed a correlation coefficient value (r

Background: Breast cancer is one of the malignant tumours which mainly affect the female population. 20% of the cases of breast cancer are due to the over-expression of Human epidermal growth factor receptor-2 (HER2), which is the dominant tyrosine kinase receptor. In general, 9-anilinoacridine derivatives play an important role in antitumor activity due to their DNA-intercalating properties. Objective: Some novel 9-anilinoacridines substituted with pyrazole moiety (1a-z) were designed and their HER2enzyme (PDB id-3PP0) inhibition activity was performed by molecular docking studies using the Glide module of Schrodinger suite 2019-4. Methods: Glide module of the Schrodinger suite was used to perform docking studies; qikprop module was used for in-silico ADMET screening and the Prime-MMGBSA module was used for free binding energy calculations. Based on GLIDE scoring functions, we can determine the binding affinity of ligands (1a-z) towards HER2. Results: The inhibitory activity of ligands against HER2 was mainly due to the strong hydrophobic and hydrogen bonding interactions. Almost all the compounds 1a-z exhibited a good binding affinity with Glide scores in the range of -4.9 to -9.75, when compared with the standard drugs CK0403 (-4.105) and Tamoxifen (-3.78). From the results of in-silico ADMET properties, it was evident that most of the compounds fell within the recommended values. MM-GBSA binding calculations of the most potent inhibitors were found to be more favourable. Conclusion: The results of in-silico studies provide strong evidence for the potential of valuable ligands in pyrazole substituted 9-anilinoacridines as HER2 inhibitors, and the compounds, 1v,s,r,d,a,o with significant Glide scores may produce significant anti-breast cancer activity.

Background In early 2020, many scientists are rushing to discover novel drugs and vaccines against the coronavirus, and treatments for COVID-19, because coronavirus disease 2019 (COVID-19), a life-threatening viral disease, affected first in China and quickly spread throughout the world. In this article, in silico studies have been performed to explore the binding modes of chemical constituents for natural remedies like Curcuma longa (turmeric) and Andrographis paniculata against COVID-19 (PDB ID 5R82) targeting coronavirus using Schrodinger suit 2019-4. The molecular docking studies are performed by the Glide module, in silico ADMET screening was performed by the QikProp module, and binding energy of ligands was calculated using the Prime MM-GB/SA module. Results The chemical constituents from turmeric like cyclocurcumin and curcumin and from Andrographis paniculata like andrographolide and dihydroxy dimethoxy flavone are significantly binding with the active site of SARS CoV-2 main protease with Glide score more than − 6 when compared to the currently used drugs hydroxychloroquine (− 5.47) and nelfinavir (− 5.93). When compared to remdesivir (− 6.38), cyclocurcumin from turmeric is significantly more active. The docking results of the compounds exhibited similar mode of interactions with SARS CoV-2. Main protease and the residues THR24, THR25, THR26, LEU27, SER46, MET49, HIE41, GLN189, ARG188, ASP187, MET165, HIE164, PHE181, and THR54 play a crucial role in binding with ligands. Conclusion Based on in silico investigations, the chemical constituents from turmeric like cyclocurcumin and curcumin and from Andrographis paniculata like andrographolide and dihydroxy dimethoxy flavone, significantly binding with the active site of SARS CoV-2 main protease, may produce significant activity and be useful for further development.

Background: 1,3,4-thiadiazolo pyrimidine is a lead molecule that is versatile for a wide variety of biological activities and in continuation of our interest in establishing some novel heterocyclic compounds for antitumor activity. Objective: The objective of the study was to synthesize series of 5-amino-7-(substituted aldehyde)-2[(naphthalene-2-yloxy)methyl] - [1,3,4]thiadiazolo-[3,2-α]-pyrimidine-6- carbonitrile derivative and evaluated for their possible in vitro and in vivo anticancer activity. Methods: Herein, we report the synthetic scheme, which was followed for the preparation of a series of title compounds B1- B9 outlined in scheme 1. The intermediate 5-[(naphthalen-2- yloxy)methyl]-1,3,4-thiadiazolo- 2-amine was prepared by heating 2-naphthoxyacetic acid and thiosemicarbazide in the presence of phosphoryl chloride at a temperature of 65-75°C. The obtained compound reacted with malononitrile and an appropriate amount of aromatic and heteroaromatic aldehydes in refluxing ethanol yielded 5-amino-7-(substituted aldehyde)-2[(naphthalene-2-yloxy)methyl] -[1,3,4]thiadiazolo-[3,2-α]-pyrimidine-6- carbonitrile derivatives (B1 – B9). The purity of the synthesized compounds was ensured by various spectral analyses. Results: In in silico molecular docking studies, compounds B3 and B9 show binding affinity like known PARP1 inhibitor olaparib. The cellular evaluation indicates that the anticancer profile of compounds B1, B3, and B9 is significant when compared to the standard drug (olaparib) against MDA-MB-232 cell line and compounds B3, B6, and B7 are the most active against MCF-7 cell lines. The most active compound B3 was subjected to acute oral toxicity studies by OECD 423 guidelines and in vivo anti-cancer studies were carried out using DMBA induced model. Conclusion: The in silico docking study of the newly synthesized compounds was performed; the results showed good binding mode in the active site of PARP1 enzyme. In silico ADME properties of synthesized compounds were also studied and showed good drug-like properties.

Coronavirus disease (COVID-19), a life-threatening disease, is caused by SARS-CoV-2. The targeted therapeutics of small molecules helps the scientific community to fight against SARS-CoV-2. In this article, some oxazine substituted 9-anilinoacridines (A1–A48) was designed by docking, MM-GBSA and molecular dynamics (MD) simulation studies for their COVID-19 inhibitory activity. The docking of ligands A1–A48 against SARS-CoV-2 (PDB ID: 5R82) are performed by using Glide module, in silico ADMET screening by QikProp module, binding energy using Prime MM-GB/SA module, MD simulation by Desmond module and atomic charges were derived by Jaguar module of Schrodinger suit 2019-4. Compound A38 has the highest G-score (−7.83) when compared to all the standard compounds which are proposed for COVID-19 treatment such as ritonavir (−7.48), lopinavir (−6.94), nelfinavir (−5.93), hydroxychloroquine (−5.47) and mataquine (−5.37). Compounds A13, A23, A18, A7, A48, A46, A32, A20, A1 and A47 are significantly active against SARS-CoV-2 main protease when compared with hydroxychloroquine and mataquine. The residues GLN19, THR24, THR25, THR26, LEU27, HIE41, SER46, MET49, ASN119, ASN142, HIE164, MET165, ASP187, ARG188 and GLN189 of SARS-CoV-2 main protease play a crucial role in binding with ligands. The in silico ADMET properties of the molecules are within the recommended values. The binding free energy was calculated using PRIME MM-GB/SA studies. From the ligands A38, A13, A23, A18, A7, A48 and A46 with significant Glide scores may produce significant COVID-19 activity for further development. Compound A38 was subjected to MD simulation at 100 ns to study the dynamic behaviour of protein–ligand complex. Communicated by Ramaswamy H. Sarma

Oxadiazoles and thiazoles are biologically important derivatives for various pharmacological activities like neuroprotective agents, ani-cancer, antimicrobial etc. Series of some thiazolidine substituted oxadiazoles 1–19 were designed for anti-parkinson's activity. Molecular docking targeted against SIRT3 by Glide module and insilco ADMET screening by qikprop module of Schrodinger suite-2016. The binding affinity of the designed molecules towards SIRT3 was selected on the basis of GLIDE score and interaction patterns. Most of the compounds 1–19 have good Glide scores when compared with standard drug Pramipexole. Many of the thiazolidine substituted oxadiazole derivatives 1–19 have good binding affinity with Glide score in the range of 4.73 to -8.72 compared with the standard Pramipexole (−6.6). The results reveals that, thiazolidine substituted oxadiazoles as SIRT3 activator and the compounds, 15, 7, 4, 19 with good Glide score may produce significant anti-parkinson's activity for further refinement.