Immobilized piperazine on the surface of graphene oxide as a heterogeneous bifunctional acid–base catalyst for the multicomponent synthesis of 2-amino-3-cyano-4H-chromenes

Published on Jul 20, 2020in Green Chemistry9.48
· DOI :10.1039/D0GC01274B
Asma Khazaee2
Estimated H-index: 2
(University of Birjand),
Roya Jahanshahi13
Estimated H-index: 13
(University of Birjand)
+ 2 AuthorsJosé M. Sansano31
Estimated H-index: 31
(University of Alicante)
Sources
Abstract
The immobilized piperazine on the surface of graphene oxide (piperazine-GO) is synthesized and characterized by different methods such as FT-IR, solid-state 29Si{1H} and 13C{1H} CP/MAS NMR, elemental analysis, TGA, TEM, FE-SEM, XPS, and TPD. Subsequently, it is used as a heterogeneous bifunctional acid-base catalyst for the efficient multicomponent reaction of malononitrile, different active compounds containing enolizable C−H bonds and various aryl/alkyl aldehydes in aqueous ethanol. A wide variety of 2-amino-3-cyano-4H-chromenes are synthesized in the presence of this heterogeneous catalyst in good to high yields and with short reaction times. The catalyst is easily separated and reused for at least six times without significant loss of activity. The acidic nature of GO improves the catalytic activity of the supported piperazine and also provided heterogeneity to the catalyst. Using aqueous ethanol as a green solvent, high turnover numbers (TON), facile catalyst recovery and reuse, simple work-up and generality of the method, make this protocol an environmentally benign procedure for the synthesis of the titled heterocycles.
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