Synthesis of Pyrazolofuropyrazine via One-Pot SNAr Reaction and Intramolecular Direct C–H Arylation

Synthesis ◽  
2018 ◽  
Vol 50 (07) ◽  
pp. 1493-1498 ◽  
Author(s):  
Shinichiro Fuse ◽  
Hiroyuki Nakamura ◽  
Megumi Inaba ◽  
Shinichi Sato ◽  
Manjusha Joshi
Keyword(s):  
Drug Discovery ◽  
Rapid Development ◽  
Ring System ◽  
Biologically Active ◽  
Drug Candidate ◽  
One Pot ◽  
Ring Systems ◽  
Drug Candidates ◽  
Fused Ring ◽  
Snar Reaction

Fused-ring systems containing heterocycles are attractive templates for drug discovery. Biologically active 6-5-5+6 fused-ring systems that possess heterocycles are available, but these require a relatively large number of synthetic steps for preparation. Therefore, pyrazolofuropyrazine was designed as a 6-5-5+6 ring system template that incorporates ready accessibility for drug discovery. Pyrazolofuropyrazines were successfully constructed in only a few steps via one-pot SNAr reaction/intramolecular C–H direct arylation. As a drug candidate, pyrazolofuropyrazine has earned a favorable LogP, although significant biological activity has yet to be established; the ready accessibility of pyrazolofuropyrazine template, however, offers an opportunity for the rapid development of promising new drug candidates.

ChemInform Abstract: 1,4,5,8-Tetraazafulvalenes - A Convenient One-Pot Synthesis and Their Conversion to Fused Ring Systems.

ChemInform ◽  
2010 ◽  
Vol 28 (29) ◽  
pp. no-no
Author(s):  
C. KAEPPLINGER ◽  
R. BECKERT ◽  
W. GUENTHER ◽  
H. GOERLS
Keyword(s):  
One Pot ◽  
Ring Systems ◽  
One Pot Synthesis ◽  
Fused Ring

scholarly journals (±)-4,12,15,18,26-Pentahydroxy-13,17-dioxaheptacyclo[14.10.0.03,14.04,12.06,11.018,26.019,24]hexacosa-1,3(14),6(11),7,9,15,19,21,23-nonaene-5,25-dione methanol disolvate

2014 ◽  
Vol 70 (5) ◽  
pp. o506-o506 ◽  
Author(s):  
Maayan Gil ◽  
Joseph Almog ◽  
Faina Dubnikova ◽  
Benny Bogoslavski ◽  
Shmuel Cohen
Keyword(s):  
Hydrogen Bonds ◽  
Three Dimensional ◽  
Ring System ◽  
Dihedral Angles ◽  
Supramolecular Architecture ◽  
Ring Systems ◽  
Compound C ◽  
Fused Ring ◽  
The Mean ◽  
Fused Ring System

The title compound, C24H14O9·2CH3OH, displays a chair-shaped form. The two dihydroindenone ring systems are located above and below the central fused-ring system, the dihedral angles between the mean planes of dihydroindenone ring systems and the mean plane of central fused-ring system are 67.91 (5) and 73.52 (4)°, respectively. In the crystal, extensive O—H...O hydrogen bonds, weak C—H...O hydrogen bonds and C—H...π interactions link the molecules into a three-dimensional supramolecular architecture.

scholarly journals A molecular modelling approach for identifying antiviral selenium-containing heterocyclic compounds that inhibit the main protease of SARS-CoV-2: an in silico investigation

2021 ◽  
Author(s):  
Ahmed Rakib ◽  
Zulkar Nain ◽  
Saad Ahmed Sami ◽  
Shafi Mahmud ◽  
Ashiqul Islam ◽  
...  
Keyword(s):  
Immune Responses ◽  
Heterocyclic Compounds ◽  
Case Fatality ◽  
Biologically Active ◽  
Dynamics Simulation ◽  
World Health ◽  
Drug Candidate ◽  
Drug Candidates ◽  
Host Immune Responses ◽  
Main Protease

Abstract Coronavirus disease 2019 (COVID-19), an infectious disease caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has been declared a global pandemic by the World Health Organization, and the situation worsens daily, associated with acute increases in case fatality rates. The main protease (Mpro) enzyme produced by SARS-CoV-2 was recently demonstrated to be responsible for not only viral reproduction but also impeding host immune responses. The element selenium (Se) plays a vital role in immune functions, both directly and indirectly. Thus, we hypothesised that Se-containing heterocyclic compounds might curb the activity of SARS-CoV-2 Mpro. We performed a molecular docking analysis and found that several of the selected selenocompounds showed potential binding affinities for SARS-CoV-2 Mpro, especially ethaselen (49), which exhibited a docking score of −6.7 kcal/mol compared with the −6.5 kcal/mol score for GC376 (positive control). Drug-likeness calculations suggested that these compounds are biologically active and possess the characteristics of ideal drug candidates. Based on the binding affinity and drug-likeness results, we selected the 16 most effective selenocompounds as potential anti-COVID-19 drug candidates. We also validated the structural integrity and stability of the drug candidate through molecular dynamics simulation. Using further in vitro and in vivo experiments, we believe that the targeted compound identified in this study (ethaselen) could pave the way for the development of prospective drugs to combat SARS-CoV-2 infections and trigger specific host immune responses.

scholarly journals Molecular Docking Study of Quercetein Analogues for Treating Tumours

2019 ◽  
Vol 12 (4) ◽  
pp. 30-34
Author(s):  
S. Gejalakshmi ◽  
N. Harikrishnan
Keyword(s):  
Molecular Docking ◽  
Drug Discovery ◽  
Structural Diversity ◽  
Docking Study ◽  
Therapeutic Agents ◽  
Drug Candidate ◽  
Molecular Docking Study ◽  
Drug Candidates ◽  
Drug Compounds ◽  
Scientific Task

Drug discovery leading to robust and viable lead candidate’s remains a challenging scientific task, which is the transition from a screening hit to a drug candidate, requires expertise and experience. Natural products and their derivatives have been recognized for many years as a source of therapeutic agents and of structural diversity. The present research attempts to describe the utilization of compounds derived from natural resources as drug candidates, with a focus on the success of these resources in the process of finding and discovering new and effective drug compounds, an approach commonly referred to as ―natural product drug discovery

Natural Products with tandem Anti-inflammatory, Immunomodulatory and Anti-SARS-CoV/2 effects: A Drug Discovery Perspective against SARS-CoV-2

2021 ◽  
Vol 28 ◽  
Author(s):  
Luana N. O. Leal da Cunha ◽  
Tiago Tizziani ◽  
Gabriella B. Souza ◽  
Monalisa A. Moreira ◽  
José S. S. Neto ◽  
...  
Keyword(s):  
Natural Products ◽  
Drug Discovery ◽  
In Silico ◽  
Biological Activities ◽  
Cysteine Proteases ◽  
Drug Candidate ◽  
Plant Metabolites ◽  
Drug Candidates ◽  
In Silico Studies ◽  
Anti Inflammatory

Background: COVID-19 is still causing victims with long-term health consequences, mass deaths, and collapsing healthcare systems around the world. The disease has no efficient drugs. However, previous studies revealed that SARS-CoV-2 and SARS-CoV have 96% and 86.5% similarities in cysteine proteases (3CLpro) and papain-like protease (PLpro) sequences, respectively. This resemblance could be significant in the search for drug candidates with antiviral effects against SARS-CoV-2. Objective: This paper is a compilation of natural products that inhibit SARS-CoV 3CLpro and PLpro and, concomitantly, reduce inflammation and/or modulate the immune system as a perspective strategy for COVID-19 drug discovery. It also presents in silico studies performed on these selected natural products using SARS-CoV-2 3CLpro and PLpro as targets to propose a list of hit compounds. Method: The plant metabolites were selected in the literature based on their biological activities on SARS-CoV proteins, inflammatory mediators, and immune response. The consensus docking analysis was performed using four different packages. Results: Seventy-nine compounds reported in the literature with inhibitory effects on SARS-CoV proteins were reported as anti-inflammatory agents. Fourteen of them showed in previous studies immunomodulatory effects. Five and six of these compounds showed significant in silico consensus as drug candidates that can inhibit PLpro and 3CLpro, respectively. Our findings corroborated recent results reported on anti-SARS-CoV-2 in the literature. Conclusion: This study revealed that amentoflavone, rubranoside B, savinin, psoralidin, hirsutenone, and papyriflavonol A are good drug candidate for the search of antibiotics against COVID-19.

Ring Closing Metathesis Approach for the Construction of Carbazoles and Indole-Fused Ring Systems

2021 ◽  
Author(s):  
Tirtha Mandal ◽  
Jyotirmayee Dash
Keyword(s):  
Organic Synthesis ◽  
Biologically Active Compounds ◽  
Biologically Active ◽  
Ring Closing Metathesis ◽  
Active Compounds ◽  
Widespread Occurrence ◽  
Ring Systems ◽  
Fused Ring

The synthesis and functionalization of carbazole ring systems have received considerable attention in organic synthesis due to their widespread occurrence in biologically active compounds . One of the classical methods...

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