Res Chem Intermed (2015) 41:6023–6032 DOI 10.1007/s11164-014-1718-2 KG-60-piperazine as an efﬁcient heterogeneous catalyst for three-component synthesis of 2-amino-2H- chromenes • • Neda Golari Mohammad Rahimizadeh Mehdi Bakavoli Esmail Rezaei-Seresht Received: 26 February 2014 / Accepted: 16 May 2014 / Published online: 10 June 2014 Springer Science+Business Media Dordrecht 2014 Abstract Silica-supported piperazine (KG-60-piperazine), as a mild and efﬁcient basic catalyst, has played a role in the three-component reaction of some substituted benzaldehydes, malononitrile, and phenols, to yield the corresponding 2-amino-2H- chromenes. The catalyst showed general utility and reusability and was reused for four additional cycles without signiﬁcant loss of its activity. Moreover, the effect of some reaction parameters such as catalyst mol%, reaction time, solvent, and temperature was investigated. Keywords 2-Amino-2H-chromenes KG-60-piperazine Three-component reaction Heterogeneous catalyst Introduction Immobilization of catalytically active species on inorganic solid materials enables not only generation of recyclable catalysts but also greater catalytic activities compared with their homogeneous precursors and analogs owing to the unique environments of these surfaces . Catalysts and reagents immobilized upon a range of insoluble supports have been utilized and reported since the late 1960s . Electronic supplementary material The online version of this article (doi:10.1007/s11164-014-1718-2) contains supplementary
Research on Chemical Intermediates – Springer Journals
Published: Jun 10, 2014
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