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Aza-Michael-type addition reaction catalysed by a supported ionic liquid phase incorporating an anionic heteropoly acid

Author:
Ghasemi, Mohammad Hadi, Kowsari, Elaheh, Shafiee, Abbas
Source:
Tetrahedron letters 2016 v.57 pp. 1150-1153
ISSN:
0040-4039
Subject:
Lewis acids, amines, catalysts, chemical reactions, chemical structure, diatomaceous earth, ionic liquids, magnetic materials, vinyl compounds
Abstract:
In this work, we have obtained substituted amines under mild conditions in good yields using the Aza-Michael-type addition of various amines to vinyl compounds catalysed by a supported ionic liquid incorporating an anionic heteropoly acid. Different catalysts, including Lewis acids, Brønsted acids and heteropoly acids were investigated in which heteropoly acids having dual Brønsted and Lewis acid characteristics were excellent catalysts. The ionic liquid incorporating a polytungstate anion supported on magnetic diatomaceous earth as a magnetically separable heterogeneous catalyst offered the best results in terms of yield. The solid nanocatalyst was easily removed with a magnet.
Agid:
5245532