DABCO catalyzed rapid one-pot synthesis of 1,4-dihydropyrano [2,3-c] pyrazole derivatives in aqueous media
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DOI: 10.1016/j.jscs.2015.06.010
Abstract: Abstract A simple and efficient protocol is developed for the synthesis of dihydropyrano[2,3-c]pyrazole derivatives by a one pot, four component reaction of ethylacetoacetate, hydrazine hydrate, malanonitrile and various aldehydes in the presence of a catalytic… read more here.
Keywords: pyrazole derivatives; dihydropyrano pyrazole; synthesis dihydropyrano; one pot ... See more keywords
Polyvinyl amine as a modified and grafted shell for Fe3O4 nanoparticles: As a strong solid base catalyst for the synthesis of various dihydropyrano[2,3-c]pyrazole derivatives and the Knoevenagel condensation
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Saudi Chemical Society"
DOI: 10.1016/j.jscs.2018.05.008
Abstract: Abstract In this work, we reported one-step deposition of polyacrylamide on nano-magnetite surface via a simple and in situ polymerization of acryl amide to form n-Fe3O4/PAM nanocomposite. The amide (–CONH2) groups could be converted easily… read more here.
Keywords: base catalyst; catalyst; various dihydropyrano; pyrazole derivatives ... See more keywords
Synthesis and antimicrobial study of 1,4-dihydropyrano[2,3-c]pyrazole derivatives in the presence of amino-functionalized silica-coated cobalt oxide nanostructures as catalyst
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DOI: 10.1016/j.poly.2019.04.063
Abstract: Abstract In this research a series of pyranopyrazoles were efficiently synthesized via the one-pot four-component reactions of ethyl acetoacetate, hydrazinehydrate, aldehydes and malononitrile in the presence of Co3O4@SiO2-tNH2 nanocomposites as catalyst. This study offers many… read more here.
Keywords: presence; study dihydropyrano; antimicrobial study; study ... See more keywords
Four-Component Synthesis of Dihydropyrano[2,3-c]pyrazole Scaffolds Using Glycerol as Green Reaction Media under Catalyst-Free Conditions
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DOI: 10.1080/10406638.2019.1709084
Abstract: Abstract A catalyst-free and convenient synthetic route to the green one-pot preparation of dihydropyrano[2,3-c]pyrazole scaffolds via four-condensation domino reaction of tandem Knoevenagel-Michael cyclocondensation reaction of ethyl acetoacetate, hydrazine hydrate, aryl aldehyde derivatives and malononitrile in… read more here.
Keywords: free conditions; catalyst free; reaction; dihydropyrano pyrazole ... See more keywords