Succinimide-N-sulfonic acid: An efficient catalyst for the synthesis of xanthene derivatives under solvent-free conditions

Synthesis of 2 H- indazolo[2,1- b ]phthalazine-1,6,11(13 H )-triones using 1,4-disulfo-1,4-diazabicyclo[2.2.2]octane-1,4-diium dihydrogen sulfate {DABCO(HSO 3 ) 2 (HSO 4 ) 2 } as a new ionic liquid catalyst

“…In recent years preparation, characterization and use of N-sulfonic acids in organic reactions became an important part of our ongoing research program [18][19][20][21][22][23][24][25][26][27][28][29][30][31], in the continuation of these studies we were interested to investigate the preparation of [DABCO](SO 3 H) 2 (HSO4) 2 and its applicability in the promotion of the organic reactions.…”

Application of silica-bonded imidazolium-sulfonic acid chloride (SBISAC) as a heterogeneous nanocatalyst for the domino condensation of arylaldehydes with 2-naphthol and dimedone

“…For example, these compounds have been frequently used as antibacterial [4], anti-inflammatory [5], and antiviral [6] agents, and as antagonists for inhibiting the action of zoxalamine [7]. Moreover, xanthene derivatives could be applied as dyes [8], and as pH sensitive fluorescent materials for visualization of biomolecular assemblies [9], and in laser technology [10]. The one-pot multi-component condensation reaction between arylaldehydes, 2-naphthol, and dimedone (5,5-dimethylcyclohexane-1,3-dione) has been used as the best procedure for synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]-xanthen-11-one derivatives.…”

Carbon Nanotube-Supported Butyl 1-Sulfonic Acid Groups as a Novel and Environmentally Compatible Catalyst for the Synthesis of 1,8-Dioxo-octahydroxanthenes

“…However, when the reactions were carried out in refluxing ethanol the desired products were obtained in high yields at very short reaction times in the presence of 0.05 mmol of catalyst (Scheme 3). In comparison with the other catalysts employed for the synthesis of tetrahydrobenzo[a]xanthen-11-ones, 31,32 MWCNT-BuSO 3 H showed a higher catalytic activity in terms of shorter reaction time and higher yields.…”