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NH 2 SO 3 H–SiO 2 as a new water‐compatible, recyclable heterogeneous catalyst for the synthesis of novel (α,β‐unsaturated) β‐amino ketones via aza‐Michael reaction
Author(s) -
Siddiqui Zeba N.,
Ahmed Nayeem
Publication year - 2013
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.3031
Subject(s) - catalysis , chemistry , differential scanning calorimetry , dispersion (optics) , scanning electron microscope , michael reaction , heterogeneous catalysis , thermal stability , organic chemistry , chemical engineering , thermodynamics , composite material , physics , materials science , optics , engineering
NH 2 SO 3 H–SiO 2 /water as a novel catalytic system was used for the synthesis of (α,β‐unsaturated) β‐amino ketones via aza‐Michael reaction at reflux conditions. The methodology was of general applicability and the catalyst exhibited activity up to five cycles. The catalyst was characterized for the first time using FT‐IR, X‐ray diffraction and scanning electron microscopic–energy dispersion analytical X‐ray. The stability of the catalyst was evaluated by differential scanning calorimetry and TGA/differential thermal analysis. High efficiency of the catalyst along with its recycling ability and the rather low loading demonstrated in reactions are the merits of the presented protocol. Copyright © 2013 John Wiley & Sons, Ltd.