the preparation of quinoxaline and 2,3-dihydropyrazine derivatives using selectfluor as an efficient and reusable catalyst
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abstract
selectfluor [1-(chloro methyl) -4-flouro -1,4-di azonia bicyclo[2,2,2] octane bis (tetraflouro-borate)] catalyzed the preparation of quinoxaline and 2,3-dihydo pyrazine derivatives through one -pot condensation of 1,2-di amines with 1,2-di carbonyls in solvent and under solvent- free conditions. this catalyst is commercially available, inexpensive, reusable, stable to air and moisture, and relatively non-toxic. furthermore, very short reaction times, high yields of products, mild reaction conditions, absence of solvent, and easy work-up are other considerable advantages of these procedures. also, a resonable mechanism has been proposed for the current reaction. the chemical structure and purity of the products were characterized by 1h nmr and ir spectroscopy.
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The preparation of quinoxaline and 2,3-dihydropyrazine derivatives using selectfluor as an efficient and reusable catalyst
Selectfluor [1-(chloro methyl) -4-flouro -1,4-di azonia bicyclo[2,2,2] octane bis (tetraflouro-borate)] catalyzed the preparation of quinoxaline and 2,3-dihydo pyrazine derivatives through one -pot condensation of 1,2-di amines with 1,2-di carbonyls in solvent and under solvent- free conditions. This catalyst is commercially available, inexpensive, reusable, stable to air and moisture, and rela...
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چکیده ندارد.
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full textNanoZnO as an efficient & reusable catalyst for the preparation of 1,4-DHPs via Hantzsch reaction
Easily prepared nanoZnO was found to be as an efficient catalyst in the synthesis of 1,4-DHPs via four-component reaction of 1,3-dicarbonyls, aldehydes and ammonium carbonate in water at 60 °C. The prepared nanoZnO was characterized by XRD and FT-IR analysis, while the determined specific surface area of nano catalyst by BET method was 33 m2/g.
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Journal title:
iranian chemical communicationPublisher: payame noor university (pnu)
ISSN 2423-4958
volume 3
issue Issue 1 (pp. 1-84) 2014
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