<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.
Nanorod vanadatesulfuric acid (VSA NRs), as a recyclable and ecologically benign catalyst, was used for the one‐pot synthesis of chalcones and 1,3,5‐triaryl‐2‐pyrazolines (TAPs). Chalcones were prepared via the condensation of substituted acetophenones with aryl‐aldehydes under solvent‐free conditions. Subsequently, the synthesized chalcones were used for the catalytic synthesis of TAPs via two‐component