Crown ethers for the synthesis of heterocycles

2021 ◽  
Vol 25 ◽  
Author(s):  
Navjeet Kaur ◽  
Neha Ahlawat ◽  
Yamini Verma ◽  
Pooja Grewal ◽  
Pranshu Bhardwaj ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Organic Synthesis ◽  
Crown Ethers ◽  
Heterocyclic Compounds ◽  
Polymeric Materials ◽  
Natural Compounds ◽  
Review Article ◽  
Biologically Active ◽  
Structural Motifs ◽  
Aromatic Heterocyclic

: Heterocyclic compounds are the largest and most diverse family of organic compounds. Among them, aromatic heterocyclic compounds are the structural motifs found in many biologically active synthetic and natural compounds, agrochemicals, and medicines. Moreover, aromatic heterocyclic compounds are extensively utilized to form dyes and polymeric materials of great importance. In organic synthesis, there are several reports on the uses of aromatic heterocyclic compounds as intermediates. In this review article, we have focused on the synthesis of heterocycles using crown ethers.

scholarly journals Recent Advances in Chalcones: Synthesis, Transformation and Pharmacological Activities

2019 ◽  
pp. 1-16
Author(s):  
Oluwaseyi Bukky Ovonramwen ◽  
Bodunde Joseph Owolabi ◽  
Amowie Philip Oviawe
Keyword(s):  
Organic Synthesis ◽  
Heterocyclic Compound ◽  
Heterocyclic Compounds ◽  
Condensation Reaction ◽  
Review Article ◽  
Pharmacological Activities ◽  
Usual Approach ◽  
Recent Advances ◽  
Anti Cancer ◽  
Multifunctional Molecules

Chalcones are useful intermediates in the synthesis of heterocyclic compound and the unique reagents in organic synthesis. The usual approach to obtain chalcones is through Claisen-Schmidt condensation. Several novel heterocyclic chalcone analogs have emerged. Chalcones are multifunctional molecules that possess promising pharmacological activities. Chalcones are known for anti-cancer, antioxidant, anti-inflammatory, anti-microbial, anti-tubercular, antileishmanial, antimalarial, anthelmintic, osteogenic activities. This review article focuses on recent applications of Claisen-Schmidt condensation reaction employed in the synthesis of chalcone, its transformation to heterocyclic compounds and pharmacological activities.

scholarly journals Iridium/Graphene Nanostructured Catalyst for the N-Alkylation of Amines to Synthesize Nitrogen-containing Derivatives and Heterocyclic Compounds

2021 ◽  
Author(s):  
Tsun-Ren Chen ◽  
Yu-Tung Chen ◽  
Yen-Hsing Lin ◽  
Hao-Chen Wang
Keyword(s):  
Organic Synthesis ◽  
Heterocyclic Compounds ◽  
Bond Formation ◽  
Biologically Active ◽  
Secondary Alcohols ◽  
Nanostructured Catalyst ◽  
Synthetic Route ◽  
Tandem Catalysis ◽  
Intermolecular Cyclization ◽  
Privileged Structures

A facile iridium/graphene-catalyzed methodology providing an efficient synthetic route for C-N bond formation is reported. This catalyst can directly promote the formation of C-N bonds, without pre-activation steps, and without solvents, alkalis and other additives. This protocol provides a direct N -alkylation of amines using a variety of primary and secondary alcohols with good selectivity and excellent yields. Charmingly, the use of diols resulted in intermolecular cyclization of amines, and such products are privileged structures in biologically active compounds. Two examples illustrate the advantages of this catalyst in organic synthesis: the tandem catalysis to synthesize hydroxyine, and the intermolecular cyclyzation to synthesize cyclizine. Water is the only by-product, which makes this catalytic process sustainable and environmentally friendly.

scholarly journals A CONCISE OVERVIEW ON HETEROCYCLIC COMPOUNDS EXHIBITING PESTICIDAL ACTIVITIES

2021 ◽  
Vol 9 (08) ◽  
pp. 989-1004
Author(s):  
Shailendra Yadav ◽  
◽  
Sushma Singh ◽  
Chitrasen Gupta ◽  
◽  
...  
Keyword(s):  
Organic Compounds ◽  
Heterocyclic Compounds ◽  
Medicinal Chemistry ◽  
Biological Activities ◽  
Review Article ◽  
Diverse Group ◽  
Concise Overview ◽  
Physiological Properties ◽  
Pharmaceutical Industries

Heterocyclic compounds are numerous and diverse group of organic compounds. Heterocycles are abundantly found in nature and express various physiological properties. Heterocycles are intricately linked to all aspects of life. There are many heterocyclic compounds currently known, and the number is constantly rising owing to extensive synthetic development and their applications. Heterocyclic compounds are used significantly in a number of areas, including biochemistry and medicinal chemistry, and some others. They are predominantly synthesized in agrochemical and pharmaceutical industries due to their potential biological activities. This review article focuses on recently synthesized heterocyclic compounds and their different pesticidal activities such as antifungal, antibacterial, antiviral, nematocidal, insecticidal, acaricidal, and herbicidal.

The Use of Cinnamic Acid and Cinnamaldehyde, as Bio-Based Molecules, in Organic Synthesis and Preparation of Biologically Active Compounds

2020 ◽  
Vol 17 ◽  
Author(s):  
Anna S. Zalivatskaya ◽  
Dmitriy N. Zakusilo ◽  
Aleksander V. Vasilyev
Keyword(s):  
Biological Activity ◽  
Double Bond ◽  
Carbonyl Group ◽  
Organic Compounds ◽  
Organic Synthesis ◽  
Cinnamic Acid ◽  
Biologically Active Compounds ◽  
Biologically Active ◽  
Active Compounds ◽  
Platform Chemicals

: Cinnamic acid and cinnamaldehyde may be obtained from renewable plant bio-mass, Cinnamon plants, therefore these compounds should be considered as bio-based platform chemicals for synthesis of novel substances. This review describes recent achievements in organic synthesis based on transformations of cinnamaldehyde, cinnamic acid and its derivatives, focusing, mainly, on the preparation of biologically active compounds. Reactions of these cinnamic derivatives may proceed both onto carbon-carbon double bond and carbonyl group that allows obtaining a wide variety of organic compounds having high synthetic importance and different practically valuable properties, including biological activity.

Biocatalytic routes toward pharmaceutically important precursors and novel polymeric systems

2005 ◽  
Vol 77 (1) ◽  
pp. 209-226 ◽  
Author(s):  
Sunil K. Sharma ◽  
Mofazzal Husain ◽  
Rajesh Kumar ◽  
Lynne A. Samuelson ◽  
Jayant Kumar ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Organic Synthesis ◽  
Organic Solvents ◽  
Low Cost ◽  
Polymeric Materials ◽  
Environmental Friendliness ◽  
Polymeric Systems ◽  
Wide Range ◽  
Synthetic Sequence

The synthetic potential of enzymes related to organic synthesis has been applied profusely, especially since the introduction of their use in organic solvents. Enzymes offer the opportunity to carry out highly chemo-, regio-, and enantioselective transformations. The use of enzymes in the synthetic sequence provides unique advantages of efficiency and environmental friendliness. Owing to their low cost and applicability to a broad range of substrates, lipases have become the most versatile class of biocatalysts in organic synthesis. We have screened a battery of lipases to carry out highly selective reactions for the synthesis of a wide range of organic compounds and polymeric materials.

scholarly journals Di-And Tri-Hydroxylated Kaurane Derivatives From Microbial Transformation Of Ent-Kaur-16-En-19-Ol By Cephalosporium Aphidicola And Their Allelopathic Activity On Lactuca Sativa (Lettuce)

2018 ◽  
Vol 34 (1) ◽  
pp. 57
Author(s):  
Diana Rocha ◽  
Jacqueline Aparecida Takahashi ◽  
Maria Amelia Diamantino Boaventura
Keyword(s):  
Organic Compounds ◽  
Organic Synthesis ◽  
Lactuca Sativa ◽  
Organic Molecules ◽  
Microbial Transformation ◽  
2D Nmr ◽  
Biologically Active ◽  
Chemical Modifications ◽  
Nmr Studies ◽  
Active Substances

The use of microorganisms to induce chemical modifications in organic molecules is a very useful tool in organic synthesis, to obtain biologically active substances. The fungus Cephalosporium aphidicola is known by its ability to hydroxylate several skeleton positions of many classes of organic compounds. In this work, the microbial transformation of ent-kaur-16-en-19-ol (1) by C. aphidicola, afforded two hydroxylated compounds, ent-kauran-16b,19-diol (2) and ent-kauran-16b,17,19-triol (3). Their structures were established by 1D and 2D-NMR studies. Both compounds were tested for their action on the growth of radical and shoot of Lactuca sativa.

A REVIEW ON RECENT ADVANCES IN CHEMISTRY, SYNTHESIS AND BIOLOGICAL APPLICATIONS OF ISATIN DERIVATIVES

2018 ◽  
pp. 16-22
Author(s):  
Shukla PK ◽  
Singh MP ◽  
Patel R
Keyword(s):  
Heterocyclic Compounds ◽  
Biologically Active ◽  
Biological Applications ◽  
Plant Origin ◽  
Recent Past ◽  
Pharmacological Activities ◽  
Naturally Occurring ◽  
Recent Advances ◽  
Biological Aspects ◽  
Isatin Derivatives

Indole and its derivatives have engaged a unique place in the chemistry of nitrogen heterocyclic compounds. The recognition of the plant growthhormone, heteroauxin, the significant amino acids, tryptamine & tryptophan and anti-inflammatory drug, indomethacine are the imperativederivatives of indole which have added stimulus to this review work. Isatin (1H-indole-2,3-dione), an indole derivative of plant origin. Althoughit is a naturally occurring compound, but was synthesized by Erdmann and Laurent in 1840 before it was found in nature. Isatin is a versatileprecursor for many biologically active molecules and its diversified nature makes it a versatile substrate for further modifications. It is concernedin many pharmacological activities like anti-malarial, antiviral, anti-allergic, antimicrobial etc; isatin and its derivatives have been also found todemonstrate promising outcomes against various cancer cell lines. This review provides a brief overview on the recent advances and futureperspectives on chemistry and biological aspects of isatin and its derivatives reported in the recent past.

Biologically Active 2,5-Disubstituted-1,3,4-Oxadiazoles

2009 ◽  
Vol 2 (1) ◽  
pp. 390-406
Author(s):  
Harish Rajak ◽  
Murli Dhar Kharya ◽  
Pradeep Mishra
Keyword(s):  
Heterocyclic Compounds ◽  
Medical Literature ◽  
Biological Activities ◽  
Biologically Active ◽  
Pharmacological Properties ◽  
Clinical Use ◽  
Synthetic Drugs ◽  
Physiologic Activity ◽  
Pharmacologically Active

There are vast numbers of pharmacologically active heterocyclic compounds in regular clinical use. The presence of heterocyclic structures in diverse types of compounds is strongly indicative of the profound effects such structure exerts on physiologic activity, and recognition of this is abundantly reflected in efforts to find useful synthetic drugs. The 1,3,4-oxadiazole nucleus has emerged as one of the potential pharmacophore responsible for diverse pharmacological properties. Medical Literature is flooded with reports of a variety of biological activities of 2,5-Disubstituted-1,3,4-oxadiazoles. The present work is an attempt to summarize and enlist the various reports published on biologically active 2,5-disubstituted-1,3,4-oxadiazoles.

Oxazole-Based Compounds As Anticancer Agents

2020 ◽  
Vol 26 (41) ◽  
pp. 7337-7371 ◽  
Author(s):  
Maria A. Chiacchio ◽  
Giuseppe Lanza ◽  
Ugo Chiacchio ◽  
Salvatore V. Giofrè ◽  
Roberto Romeo ◽  
...  
Keyword(s):  
Cancer Research ◽  
Drug Discovery ◽  
Anticancer Agents ◽  
Heterocyclic Compounds ◽  
Chemical Diversity ◽  
Biologically Active ◽  
New Drugs ◽  
The Core ◽  
Anti Cancer ◽  
Biologically Active Derivatives

: Heterocyclic compounds represent a significant target for anti-cancer research and drug discovery, due to their structural and chemical diversity. Oxazoles, with oxygen and nitrogen atoms present in the core structure, enable various types of interactions with different enzymes and receptors, favoring the discovery of new drugs. Aim of this review is to describe the most recent reports on the use of oxazole-based compounds in anticancer research, with reference to the newly discovered iso/oxazole-based drugs, to their synthesis and to the evaluation of the most biologically active derivatives. The corresponding dehydrogenated derivatives, i.e. iso/oxazolines and iso/oxazolidines, are also reported.

Ionic Liquids for the Synthesis of Five-Membered N,N-, N,N,N- and N,N,N,NHeterocycles

2019 ◽  
Vol 23 (11) ◽  
pp. 1214-1238 ◽  
Author(s):  
Navjeet Kaur ◽  
Pranshu Bhardwaj ◽  
Meenu Devi ◽  
Yamini Verma ◽  
Neha Ahlawat ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Organic Synthesis ◽  
Heterocyclic Compounds ◽  
Reaction Medium ◽  
Environmental Issues ◽  
Organic Reaction ◽  
Environment Friendly ◽  
The Past ◽  
Area Of Interest ◽  
Major Subject

Due to special properties of ILs (Ionic Liquids) like their wide liquid range, good solvating ability, negligible vapour pressure, non-inflammability, environment friendly medium, high thermal stability, easy recycling and rate promoters etc. they are used in organic synthesis. The investigation for the replacement of organic solvents in organic synthesis is a growing area of interest due to increasing environmental issues. Therefore, ionic liquids have attracted the attention of chemists and act as a catalyst and reaction medium in organic reaction with high activity. There is no doubt that ionic liquids have become a major subject of study for modern chemistry. In comparison to traditional processes the use of ionic liquids resulted in improved, complimentary or alternative selectivities in organic synthesis. The present manuscript reported the synthesis of multiple nitrogen containing five-membered heterocyclic compounds using ionic liquids. This review covered interesting discoveries in the past few years.

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