27301-45-7Relevant academic research and scientific papers
Regioselective synthesis of 1,3,5-trisubstituted pyrazoles
Desai, Vidya G.,Satardekar, Pooja C.,Polo, Sampada,Dhumaskar, Kashinath
, p. 836 - 842 (2012/01/15)
A new and a simple approach toward synthesis of 1,3,5-trisubstituted pyrazoles from chalcone arylhydrazones via oxidative cyclization has been achieved. 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone was successfully used as an oxidizing agent to give excellen
Regioselective synthesis of multisubstituted pyrazoles via cyclocondensation of β-thioalkyl-α,β-unsaturated ketones with hydrazines
Jin, Weiwei,Yu, Haifeng,Yu, Zhengkun
experimental part, p. 5884 - 5887 (2011/12/02)
Multisubstituted pyrazoles were efficiently synthesized by cyclocondensation of β-thioalkyl-α,β-unsaturated ketones with hydrazines under relatively mild conditions. A one-pot synthetic protocol through tandem Liebeskind-Srogl cross-coupling/cyclocondensation using a-oxo ketene dithioacetals as the starting materials was also realized for the same purpose.
4-(p-Chloro)phenyl-1,2,4-triazole-3,5-dione as a novel and reusable reagent for the oxidation of 1,3,5-trisubstituted pyrazolines under mild conditions
Zolfigol, Mohammad Ali,Azarifar, Davood,Mallakpour, Shadpour,Mohammadpoor-Baltork, Iraj,Forghaniha, Ali,Maleki, Behrooz,Abdollahi-Alibeik, Mohammad
, p. 833 - 836 (2007/10/03)
4-(p-Chloro)phenyl-1,3,4-triazole-3,5-dione is used as an effective oxidizing agent for the oxidation of 1,3,5-trisubstituted pyrazolines to their corresponding pyrazoles under mild conditions with moderate to good yields at room temperature.
Microwave-assisted aromatization of 1,3,5-trisubstituted 2-pyrazolines by Bi(NO3)3 · 5H2O, as a novel and convenient oxidizing agent
Azarifar, Davood,Maleki, Behrooz
, p. 2581 - 2585 (2007/10/03)
Bismuth(III) nitrate pentahydrate, Bi(NO3)3 · 5H2O, has been used as a mild, efficient, and inexpensive oxidant for the oxidative aromatization of several 1,3,5-trisubstituted 2-pyrazolines to pyrazoles in acetic acid unde
Tricholoroisocyanuric acid as a useful reagent in microwave-assisted aromatization of 1,3,5-trisubstituted 2-pyrazolines
Azarifar, Davood,Maleki, Behrooz
, p. 1215 - 1217 (2007/10/03)
An efficient aromatization of 1,3,5-trisubstituted 2-pyrazolines to their corresponding pyrazoles has been performed by tricholoroisocyanuric acid [TCCA] under microwave irradiation in excellent yields. It has been observed that the reactions occur more r
Microwave-assisted aromatization of 1,3,5-trisubstituted 2-pyrazolines by silica-supported N-bromosuccinimide as a useful reagent under solvent free 'dry' condition
Azarifar, Davood,Maleki, Behrooz
, p. 865 - 870 (2007/10/03)
An efficient aromatization of 1,3,5-trisubstituted 2-pyrazolines to theircorresponding pyrazoles by NBS was carried out under microwave irradiation and solvent-free conditions in moderate yields. It has also been observed that, by activating the NBS reage
N,N′,N,N′-tetrabromo-benzene-1,3-disulfonylamide as a novel reagent for oxidative aromatization of 1,3,5-trisubstituted pyrazolines under heterogeneous and solvent-free conditions
Ghorbani-Vaghei, Ramin,Azarifar, Davood,Khazaei, Ardeshir,Maleki, Behrooz
, p. 1877 - 1881 (2007/10/03)
1,3,5-Trisubstituted pyrazolines were converted to the corresponding pyrazoles in good yields under heterogeneous and solvent-free conditions by N,N′,N,N′-tetrabromo-benzene-1,3-disulfonylamide [TBBDA] at ambient temperature.
Silica-supported 1,3-dibromo-5,5-dimethylhydantoin (DBH) as a useful reagent for microwave-assisted aromatization of 1,3,5-trisubstituted pyrazolines under solvent-free conditions
Azarifar, Davood,Zolfigol, Mohammad Ali,Maleki, Behrooz
, p. 1744 - 1746 (2007/10/03)
1,3,5-Trisubstituted pyrazolines are rapidly and conveniently oxidized to their corresponding pyrazoles by 1,3-dibromo-5,5-dimethylhydantoin (DBH) under microwave irradiation and solvent-free conditions. The presence of silica gel as a supporting agent is
Trichloroisocyanuric acid as a novel oxidizing agent for the oxidation of 1,3,5-trisubstituted pyrazolines under both heterogeneous and solvent free conditions
Zolfigol, Mohammad Ali,Azarifar, Davood,Maleki, Behrooz
, p. 2181 - 2183 (2007/10/03)
Trichloroisocyanuric acid is used as an effective oxidizing agent for the oxidation of 1,3,5-trisubstituted pyrazolines to their corresponding pyrazoles under both heterogeneous and also solvent free conditions with good yields at room temperature.
