Fe-exchanged montmorillonite K10––the first heterogeneous catalyst for acylation of sulfonamides with carboxylic acid anhydrides

Singh, Devendrapratap U.; Singh, Priyanka; Samant, Shriniwas D.

doi:10.1016/j.tetlet.2004.04.077

Cited by 38 publications

(14 citation statements)

References 14 publications

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“…Relatively few reports in the literature describe the Nacylation of sulfonamides in acidic conditions: To this end, sulfuric acid 96% [8] or Fe-exchanged montmorillonite K-10 [9] and high temperatures are necessary to obtain desired transformations. The use of Lewis acids as catalysts was also explored, giving good yields of products in short times and under mild conditions.…”

Section: Acylation Of Sulfonamidesmentioning

confidence: 99%

N‐acylsulfonamides: Synthetic routes and biological potential in medicinal chemistry

et al. 2017

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Sulfonamide is a common structural motif in naturally occurring and synthetic medicinal compounds. The rising interest in sulfonamides and N-acyl derivatives is attested by the large number of drugs and lead compounds identified in last years, explored in different fields of medicinal chemistry and showing biological activity. Many acylsulfonamide derivatives were designed and synthesized as isosteres of carboxylic acids, being the characteristics of these functional groups very close. Starting from chemical routes to N-acylsulfonamides, this review explores compounds of pharmaceutical interest, developed as enzymatic inhibitors or targeting receptors.

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Section: Acylation Of Sulfonamidesmentioning

confidence: 99%

N‐acylsulfonamides: Synthetic routes and biological potential in medicinal chemistry

et al. 2017

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“…Recently, clay based-materials such as K10-montmorillonite has attracted more attention since they are considered as environmentally friendly and recyclable catalysts [33], [34].The commercially available K10montmorillonite is a smectite clay activated by inorganic acid. The acid treatment increases BET surface area (change pore size distribution of montmorillonite) and results in an acidity strengthening hybrid catalysts.…”

Section: Introductionmentioning

confidence: 99%

Influence of Montmorillonite K10 Modification with Tungstophosphoric Acid on Hybrid Catalyst Activity in Direct Dimethyl Ether Synthesis from Syngas

et al. 2014

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Dimethyl ether synthesis was performed from syngas over hybrid catalysts comprising a Cu/Zn/Al as metallic function and K10-montorillonite (K10) as acidic function. The acidic properties of K10 were tuned by deposition of one monolayer of tungstophosphoric acid (H 3 PW 12 O 40 Á23.5 H 2 O, TPA). The changes in acidity were determined based on pyridine adsorption with FTIR detection. Due to the fact that TPA does not possess Lewis acid sites, deposition of TPA on the K10 surface (TPA-K10) resulted only in increase in Brønsted acid site concentrations and in increase in their strength in comparison with unmodified K10. Since both modified and unmodified K10 exhibited the same Lewis acid site concentrations and their strength, it was possible to investigate solely the impact of Brønsted acidity differences of acidic functions on the hybrid catalysts activity in syngas-to-DME process (STD). Additionally, the effect of TPA supported on K10 was investigated in methanol dehydration to DME under atmospheric pressure. In order to prepare metallic functions which differed in activity in CO hydrogenation to methanol (first step of STD), two synthesis methods were used: co-precipitation method (metallic function CZA) and decomposition of citrate complexes of metals (metallic function CZA citric). The hybrid catalysts (CZA/K10, CZA/ TPA-K10, CZA citric /K10, CZA citric /TPA-K10) for STD were prepared by physical mixing of metallic and acidic function in volume ratio equal to 2:1. The impact of K10 substitution with TPA-10 in hybrid catalysts depended on whether STD process was controlled by methanol synthesis step or dehydration methanol step. When K10 possessed adequate acidity to dehydrate methanol formed on metallic function (i.e. CZA citric), it substitution with TPA-K10 in hybrid catalyst did not improve DME yield. On the other hand, when metallic function (i.e. CZA) exhibited higher methanol activity and methanol dehydration rate was limited by insufficient acidity of K10 then usage of TPA-K10 of higher acidity in hybrid catalyst was found to increase significantly DME yield without light parrafins formation.

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“…Many findings on iron as heterogeneous catalyst have been reported [3][4][5][6]. For example, Fe 3+ exchanged with montmorillonite-K10 was used as a heterogeneous catalyst in the oxidation of many kinds of primary and secondary alcohols [3].…”

Section: Introductionmentioning

confidence: 99%

Amino benzoic acid modified silica—An improved catalyst for the mono-substituted product in the benzylation of toluene with benzyl chloride

Adam

Andas

2007

Journal of Colloid and Interface Science

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Fe-exchanged montmorillonite K10––the first heterogeneous catalyst for acylation of sulfonamides with carboxylic acid anhydrides

Cited by 38 publications

References 14 publications

N‐acylsulfonamides: Synthetic routes and biological potential in medicinal chemistry

N‐acylsulfonamides: Synthetic routes and biological potential in medicinal chemistry

Influence of Montmorillonite K10 Modification with Tungstophosphoric Acid on Hybrid Catalyst Activity in Direct Dimethyl Ether Synthesis from Syngas

Amino benzoic acid modified silica—An improved catalyst for the mono-substituted product in the benzylation of toluene with benzyl chloride

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