- Efficient multi-component synthesis of highly substituted imidazoles utilizing P2O5/SiO2 as a reusable catalyst
-
Phosphorus pentoxide supported on silica gel (P2O 5/SiO2) has been used as an efficient and reusable catalyst for the one-pot pseudo four-component synthesis of 2,4,5-trisubstituted imidazoles from benzil or benzoin, aldehydes, and ammonium acetate. It was also used for four-component preparation of 1,2,4,5-tetrasubstituted imidazoles from benzil or benzoin, aldehydes, primary amine, and ammonium acetate under thermal solvent-free conditions. The remarkable features of this new procedure are high conversions, cleaner reaction, simple experimental and work-up procedures and also the catalyst can be easily separated from the reaction mixture and reused several times without any loss of its activity.
- Shaterian, Hamid Reza,Ranjbar, Mohammad,Azizi, Kobra
-
experimental part
p. 1635 - 1645
(2012/01/06)
-
- Synthesis of highly substituted imidazoles using Bronsted acidic ionic liquid, triphenyl(propyl-3-sulphonyl)phosphonium toluenesulfonate, as reusable catalyst
-
Bronsted acidic ionic liquid, triphenyl(propyl-3-sulphonyl) phosphonium toluenesulfonate, has been used as an efficient and reusable catalyst for the one-pot synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles under solvent-free conditions in excellent yields.
- Shaterian,Ranjbar,Azizi
-
experimental part
p. 1120 - 1134
(2012/02/04)
-
- An environmental friendly approach for the synthesis of highly substituted imidazoles using Br?nsted acidic ionic liquid, N-methyl-2-pyrrolidonium hydrogen sulfate, as reusable catalyst
-
Br?nsted acidic ionic liquid, N-methyl-2-pyrrolidonium hydrogen sulfate, has been used as an efficient and reusable catalyst for the one-pot synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles under thermal solvent-free conditions in excellent yields.
- Shaterian, Hamid Reza,Ranjbar, Mohammad
-
experimental part
p. 40 - 49
(2012/03/09)
-
- Silica-bonded S-sulfonic acid: A recyclable catalyst for the synthesis of trisubstituted imidazoles under solvent-free conditions
-
Trisubstituted imidazoles have been synthesized in high yields in the presence of silica-bonded S-sulfonic acid as a catalyst. The reaction was carried out at 130 °C under solvent-free conditions. The reaction work-up is simple and the catalyst is easily separated from the products by filtration.
- Niknam, Khodabakhsh,Mohammadizadeh, Mohammad R.,Mirzaee, Salimeh,Saberi, Dariush
-
experimental part
p. 663 - 669
(2010/10/19)
-
- Potassium aluminum sulfate (alum): An efficient catalyst for the one-pot synthesis of trisubstituted imidazoles
-
Trisubstituted imidazoles were synthesized in high yields in the presence of potassium aluminum sulfate (alum) as a non-toxic, reusable, inexpensive, and easily available reagent at 70°C.
- Mohammadi, Ali A.,Mivechi, Mersede,Kefayati, Hassan
-
experimental part
p. 935 - 937
(2009/09/25)
-