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Zeinali-Dastmalbaf, Mohsen,Davoodnia, Abolghasem,Heravi, Majid M.,Tavakoli-Hoseini, Niloofar,Khojastehnezhad, Amir,Zamani, Hassan Ali Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
A green and efficient method for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones and -thiones through one-pot three-component reaction of ethyl acetoacetate, an aryl aldehyde, and urea or thiourea in acetonitrile using silica gel-supported polyphosphoric acid (PPA-$SiO_2$) as catalyst is described. Compared to the classical Biginelli reaction conditions, the present methodology offers several advantages such as high yields, relatively short reaction times, mild reaction condition and a recyclable catalyst with a very easy work up.
Mohsen Zeinali-Dastmalbaf,Abolghasem Davoodnia,Niloofar Tavakoli-Hoseini,Amir Khojastehnezhad,Majid M. Heravi,Hassan Ali Zamani 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
A green and efficient method for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones and -thiones through one-pot three-component reaction of ethyl acetoacetate, an aryl aldehyde, and urea or thiourea in acetonitrile using silica gel-supported polyphosphoric acid (PPA-SiO_2) as catalyst is described. Compared to the classical Biginelli reaction conditions, the present methodology offers several advantages such as high yields, relatively short reaction times, mild reaction condition and a recyclable catalyst with a very easy work up.
Haniyeh Norouzi,Abolghasem Davoodnia,Mehdi Bakavoli,Mohsen Zeinali-Dastmalbaf,Niloofar Tavakoli-Hoseini,Mahmoud Ebrahimi 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.7
Alumina supported polyphosphoric acid (PPA/Al_2O_3) was successfully prepared by impregnation of alumina support by polyphosphoric acid and characterized using FT-IR spectroscopy, the N_2 adsorption/desorption analysis (BET), thermal analysis (TG/DTG), and X-ray diffraction (XRD) techniques. The catalytic behavior of this new solid acid supported heterogeneous catalyst was checked in the synthesis of 14-aryl-14Hdibenzo[a, j]xanthenes by cyclocondensation reaction of β-naphthol and aryl aldehydes under solvent-free conditions. The results showed that the novel catalyst has high activity and the desired products were obtained in very short reaction times with high yields. Moreover, the catalyst can be easily recovered by filtration and reused at least three times with only slight reduction in its catalytic activity.
Norouzi, Haniyeh,Davoodnia, Abolghasem,Bakavoli, Mehdi,Zeinali-Dastmalbaf, Mohsen,Tavakoli-Hoseini, Niloofar,Ebrahimi, Mahmoud Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.7
Alumina supported polyphosphoric acid (PPA/$Al_2O_3$) was successfully prepared by impregnation of alumina support by polyphosphoric acid and characterized using FT-IR spectroscopy, the $N_2$ adsorption/desorption analysis (BET), thermal analysis (TG/DTG), and X-ray diffraction (XRD) techniques. The catalytic behavior of this new solid acid supported heterogeneous catalyst was checked in the synthesis of 14-aryl-14H-dibenzo[a, j]xanthenes by cyclocondensation reaction of ${\beta}$-naphthol and aryl aldehydes under solvent-free conditions. The results showed that the novel catalyst has high activity and the desired products were obtained in very short reaction times with high yields. Moreover, the catalyst can be easily recovered by filtration and reused at least three times with only slight reduction in its catalytic activity.