Magnesium Incorporated White Sandstone as a Green and Efficient Heterogeneous Catalyst for One‐Pot Synthesis of 1,2,3,4‐Tetrasubstituted Pyrroles

다국어 초록 (Multilingual Abstract)

A simple, convenient and four‐component method for synthesis of 1,2,3,4‐tetrasubstituted pyrroles has been developed by using of magnesium containing nano silica catalyst. This strategy demonstrates the coupling reactions of aromatic aldehydes, 1,3‐dicarbonyl compounds, aniline derivatives and nitromethane, over the one pot procedure. The polysubstituted 4‐(imidazole‐1‐yl) aniline derivatives were also used as amine precursor at above reaction and the obtained products were evaluated on their emission properties. The modified natural source white sandstone which was appeared as an efficient, recyclable and green catalyst at the desired reaction, was fully characterized by different methods.
We report in this paper the first use of metal ion adsorbent made by white sand stone, as an efficient catalyst for the synthesis of substituted pyrroles through a four‐component reaction. The modified sandstone was characterized by fourier transform infrared spectroscopy, flame atomic absorption spectrometer, x‐ray diffraction, energy dispersive x‐ray spectroscopy, scanning electron microscopy, transmission electron microscopy and surface area measurement analysis. In addition to known pyrrole derivatives which have been synthesized by this new method, some other new products possessing polyaryl substituted imidazole moiety have also been synthesized and fully characterized. The products were also studied in view of their emission properties.