Introduction of a Novel Nano Sized N-Sulfonated Bronsted Acidic Homogeneous Catalyst for the Promotion of the Synthesis of 2H-Indazolo[2,1-b] Phthalazine-1,6,11(13H)-Triones

In this research work, 4,4'-(butane-1,4-diyl) bis(1-sulfo-1,4-diazabicyclo[2.2.2]octane-1,4-diium) tetrachloride (NS-C4(DABCO-SO3H)(2)center dot 4Cl) as a new nano-sized N-sulfonic acid was prepared and characterized using different types of spectroscopic methods including FT-IR, H-1 NMR, C-13 NMR, XRD, TGA and SEM analysis. This new reagent was efficiently used as catalyst for the promotion of the one-pot synthesis of 2H-indazolo[2,1-b] phthalazine-1,6,11(13H)-triones derivatives, as a class of biologically active compounds with important pharmaceutical properties, under solvent-free conditions during short reaction times in high yields.