<i>N</i>,<i>N</i>′,<i>N</i>,<i>N</i>′-TETRABROMO-BENZENE-1,3-DISULFONYLAMIDE AS A NOVEL REAGENT FOR OXIDATIVE AROMATIZATION OF 1,3,5-TRISUBSTITUTED PYRAZOLINES UNDER HETEROGENEOUS AND SOLVENT-FREE CONDITIONS
1,3,5-Trisubstituted pyrazolines were converted to the corresponding pyrazoles in good yields under heterogeneous and solvent-freeconditions by N,N′,N,N′-tetrabromo-benzene-1,3-disulfonylamide [TBBDA] at ambient temperature.
1,3,5-Trisubstituted pyrazolines to pyrazoles are carried out efficiently in the presence of new reagents N,N,N',N'-tetrabromo-benzene-1,3-disulfonylamine [TBBDA] and N,N'-dibromo-N,N'-1,2-ethanediylbis-(p-toluenesulphonamide) [BNBTS] in solvent-freeconditions with catalytic amounts of SiO 2 under microwave irradiation in high yields.
Trichloroisocyanuric acid as a novel oxidizing agent for the oxidation of 1,3,5-trisubstituted pyrazolines under both heterogeneous and solvent free conditions
作者:Mohammad Ali Zolfigol、Davood Azarifar、Behrooz Maleki
DOI:10.1016/j.tetlet.2004.01.038
日期:2004.3
Trichloroisocyanuric acid is used as an effective oxidizing agent for the oxidation of 1,3,5-trisubstitutedpyrazolines to their corresponding pyrazoles under both heterogeneous and also solvent free conditions with good yields at room temperature.
Microwave-assisted Aromatization of 1,3,5-Trisubstituted 2-Pyrazolines by Silica-supported N-Bromosuccinimide as a Useful Reagent under Solvent Free ‘Dry’ Condition
作者:Davood Azarifar、Behrooz Maleki
DOI:10.3987/com-04-10276
日期:——
An efficient aromatization of 1,3,5-trisubstituted2-pyrazolines to their corresponding 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 reagent on silica gel as a support the reaction times can be dramatically reduced and good yields are obtained.
Microwave‐Assisted Aromatization of 1,3,5‐Trisubstituted 2‐Pyrazolines by Bi(NO<sub>3</sub>)<sub>3</sub> · 5H<sub>2</sub>O, as a Novel and Convenient Oxidizing Agent
作者:Davood Azarifar、Behrooz Maleki
DOI:10.1080/00397910500214136
日期:2005.10
Abstract 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 under microwave irradiation with good to excellent yields.