SYNTHESIS AND BIOLOGICAL SIGNIFICANCE OF PYRAZOLONES: A REVIEW
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Review on the Synthesis and Applications of Nanomaterials
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CONCLUSION: On the basis of literature survey, pyrazolone derivatives exhibits antimicrobial, anti-inflammatory, analgesic, anticancer and antitubercular activities. This review gives an overview of various synthetic routes used to form a biologically rich pyrazolone moiety. The possible improvements in the activity can be further achieved by slight modifications in the substituents on the basic pyrazolone nucleus. This article proves to be helful for further research work on the bioactive pyrazolone ring and as an important tool for the development of better medicinal agents.
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ABSTRACT: Heterocyclic compounds are acquiring more importance in recent years because of their pharmacological activities. Pyrazolones have a particular value due to their broad spectrum of biological activity and their wide ranging utility as synthetic tools in the design of various bioactive molecules. Pyrazolone is a five membered lactum ring, containing two nitrogen and one ketonic group in its structure. In addition, pyrazolones possess antimicrobial, antifungal, antimycobacterial, antibacterial, anti-inflammatory, antitumor, gastric secretion stimulatory, antidepressant and antifilarial activities. They also serve as precursors for dyes, pigments, pesticides and chelating agents, besides finding applications in the extraction and separation of various metal ions. The high therapeutic properties of the pyrazolone releted drugs have encouraged the medicinal chemists to synthesized a large number of novel chemotherapeutic agents. Numerous methods for the synthesis of pyrazolone and also their various structure reactions offer enormous scope in the field of medicinal chemistry. This articles aims to review the work reported, their chemistry and biological activities of pyrazolone during past years.
We concluded that human nutrients are not contributing to the episodic fish kills in Central Hood Canal but, due to limitations in the available science, we were unable to determine whether or not human nutrients are violating water quality standards in Lynch Cove.
The second pdf above includes three documents: (1) Cover letter for EPA and Department of Ecology review of science and regulatory options, (2) HCCC letter requesting science review and regulatory options, and (3) Water quality regulations applicable in Hood Canal.
Meta-synthesis method for qualitative research: a literature review
The chemistry of pyrimidine is a blossoming field. Numerous method for the synthesis of pyrimidine and also their diverse reactions offer enormous scope in the filed of medicinal chemistry. The utility of pyrimidines as synthon for various biologically active compounds has given impetus to these studies. The review article aims to review the work reported and the chemistry and biological activities of pyrimidines during past year.
Liu et al.19 have been reported a novel solid-state reversible fluorescence photo switching system (FPS) based on photochromism of photochromic pyrazolones has been developed by employing phosphor Sr2P2O7 co-doped with europium ion and chlorine ion (Sr2P2O7–EC). (3-chlorophenyl)(5-hydroxy-1,3-diphenyl-1H-pyrazol-4-yl)methanone 4 react with N-phenyl hydrazinecarboxamide 5 to form 1,3-diphenyl-4-(3-chlorobenzal)-5-hydroxypyrazole-4-phenylsemi carbazone 6 as the fluorescence dye and the photochromic compound, respectively.
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SCHEME 4: SYNTHESIS OF 1-(4-METHYLCOUMARINYL-7-OXYACETYL)-3, 5-DIMETHYL-4-(ARYLAZO) PYRAZOLES AND 1-(4-METHYLCOUMARINYL-7-OXYACETYL)-3-METHYL-4-(SUBSTITUTED PHENYL) HYDRAZONO-2-PYRAZOLIN-5-ONE ETHYL-2-(SUBSTITUTED PHENYL) HYDRAZONO-3-OXOBUTYRATE
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Ziarati et al. 42 have been reported simple and green process to prepare copper iodide in nano scale via sonication was carried out. Subsequently, this nanoparticles was used as an efficient catalyst for the synthesis of 2-aryl-5-methyl-2,3-dihydro-1H-3-pyrazolones 111 via four-component reaction of hydrazine 107, ethyl acetoacetate 108, aldehyde 109 and β-naphthol 110 in water under ultrasound irradiation.
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