Tungstophosphoric acid/zirconia composites prepared by the sol–gel method: An efficient and recyclable green catalyst for the one-pot synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes

Rivera, Toa S.; Sosa, Alexis Alberto; Romanelli, Gustavo Pablo; Blanco, Mirta N.; Pizzio, Luis R.

doi:10.1016/j.apcata.2012.08.001

Cited by 33 publications

(17 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the search of new technologies, with low environmental impact for the synthesis of organic compounds, our research group has reported some results about the use of TPA /zirconia, in the synthesis of quinoxalines [29] and 14-aryl-14H-dibenzo [a, j] xanthenes [30].…”

Section: (Figure 1)mentioning

confidence: 99%

Biomass valorization derivatives: Clean esterification of 2-furoic acid using tungstophosphoric acid/zirconia composites as recyclable catalyst

Escobar

Sathicq

Pizzio

et al. 2015

Process Safety and Environmental Protection

View full text Add to dashboard Cite

Section: (Figure 1)mentioning

confidence: 99%

Biomass valorization derivatives: Clean esterification of 2-furoic acid using tungstophosphoric acid/zirconia composites as recyclable catalyst

Escobar

Sathicq

Pizzio

et al. 2015

Process Safety and Environmental Protection

View full text Add to dashboard Cite

“…HPAs possess a very strong acidity, which can be changed by varying the chemical composition of the primary structure of the heteropolyanion. As part of a research project to develop eco-efficient organic transformation, especially multicomponent reactions, we used different bulk, supported and included heteropolyacids in the preparation of heterocyclic synthesis, under greener conditions, such as the synthesis of functionalized pyridine [13], substituted 3,4-dihydropyrimidin-2-(1H)-ones [14], 14-aryl-14H-dibenzo[a, j]xanthenes [15], highly substituted hexahydropyrimidines [16], and ferrocenyl-pyrimidones [17].…”

Section: Introductionmentioning

confidence: 99%

First Report About the Use of Micellar Keggin Heteropolyacids as Catalysts in the Green Multicomponent Synthesis of Nifedipine Derivatives

et al. 2016

Self Cite

View full text Add to dashboard Cite

Micellar Keggin heteropolyacid catalysts were prepared using hexadecyltrimethylammonium bromide (cetyltrimethylammonium bromide-CTAB), 1-hexadecylpyridinium chloride, and Keggin heteropolyacids H 3 PMo 12 O 40 and H 4 PMo 11 VO 40 as precursors. Four catalysts were prepared (PMo12C16, PMo11VC16, PMo12C 16Py, and PMo11VC16Py) and characterized by 31 P NMR, FT-IR, XRD, SEM analysis and textural properties (S BET ). The acidic characteristics of the catalysts were determined by potentiometric titration with n-butylamine. A series of bioactive 1,4-dihydropyridine derivatives such as nifedipine and nemadipine B were synthesized using these new materials, in a one-pot procedure in ethanol. This methodology requires a reaction time of 8 h, and a temperature of 78°C to obtain good to excellent yields of 1,4-dihydropyridine derivatives. The micellar Keggin catalysts are insoluble in polar media, which allows easy removal of the reaction products without affecting their catalytic activity. The leaching test showed that they have an excellent stability and can be used five times as heterogeneous catalysts without appreciable loss of the catalytic activity. Using the same material, unsymmetrical 1,4-dihydropyridines such as nitrendipine can be obtained through a sequence of steps in very good yield (78 %). Graphical Abstract

show abstract

“…Consequently, introducing efficient methods for production of this class of heterocycles using novel and attractive catalysts is practically important. An important subgroup of xanthene derivatives is 14-aryl-14H-dibenzo [a,j]xanthenes which produce by the reaction of 2-napthol with arylaldehydes using a catalyst [18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Novel ionic liquid [Et3N-SO3H][MeSO3]: Synthesis, characterization and catalytic performance for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes

Takallo¹,

Zare²

2019

Bull. Chem. Soc. Eth.

View full text Add to dashboard Cite

The main aim of this work is introducing a novel protic acidic ionic-liquid catalyst for organic synthesis. Thus, N,N-diethyl-N-sulfoethanaminium methanesulfonate ([Et3N-SO3H][MeSO3]) was synthesized by the reaction of triethylamine with chlorosulfonic acid, and then with methanesulfonic acid. The structure of this novel protic acidic ionic liquid was identified by FT-IR, 1 H NMR, 13 C NMR and mass spectral data. Its catalytic activity was examined for the solvent-free reaction of 2-naphthol with arylaldehydes to provide 14-aryl-14Hdibenzo[a,j]xanthenes. [Et3N-SO3H][MeSO3] efficiently catalyzed the reaction, and the products were obtained in high to excellent yields and in short reaction times.

show abstract

Tungstophosphoric acid/zirconia composites prepared by the sol–gel method: An efficient and recyclable green catalyst for the one-pot synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes

Cited by 33 publications

References 51 publications

Biomass valorization derivatives: Clean esterification of 2-furoic acid using tungstophosphoric acid/zirconia composites as recyclable catalyst

Biomass valorization derivatives: Clean esterification of 2-furoic acid using tungstophosphoric acid/zirconia composites as recyclable catalyst

First Report About the Use of Micellar Keggin Heteropolyacids as Catalysts in the Green Multicomponent Synthesis of Nifedipine Derivatives

Novel ionic liquid [Et3N-SO3H][MeSO3]: Synthesis, characterization and catalytic performance for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes

Contact Info

Product

Resources

About