Nano-Fe₃O₄@SiO₂-supported boron sulfonic acid as a novel magnetically heterogeneous catalyst for the synthesis of pyrano coumarins

Abstract

A novel magnetically heterogeneous catalyst based on the immobilization of boron sulfonic acid onto Fe3O4@SiO2 nanoparticles (Fe3O4@SiO2–BSA) is reported. It was characterized via FT-IR, XRD, SEM, EDS, and VSM analysis.

Prospecting for cytotoxic and antiprotozoal 4‐aryl‐4H‐chromenes and 10‐aryldihydropyrano[2,3‐f]chromenes

“…The reaction between 3 , methyl α‐cyanoacetate ester, and cinnamaldehyde did not form the desired product; in contrast, compound 15 was obtained from the Knoevenagel condensation of methyl α‐cyanoacetate ester and cinnamaldehyde. Since the cyclization step might occur via a Michael addition mechanism, the strong electron delocalization in 15 presumably reduced its reactivity in the presence of phloroglucinol. The reaction procedure herein used for the preparation of compounds 4 – 15 obtained with moderate to high yield was previously reported in the literature …”

“…Sixteen of the prepared compounds were newly reported, while compounds 3 , 15 , 20 , and 22 were known …”

(3‐Oxo‐[1,2,4]triazolidin‐1‐yl)bis (butane‐1‐sulfonic acid) functionalized magnetic γ‐Fe2O3 nanoparticles: A novel and heterogeneous nanocatalyst for one‐pot and efficient four‐component synthesis of novel spiro[indeno[1,2‐b]quinoxaline derivatives

“…In order to assess the effect of temperature on the reaction, we carried out the reactions at various temperatures as shown in (Table 1, entries 17,20,21,22). Catalytic activity increases in high temperature (Table 1, entry 17).…”

“…[9][10][11] Easy separation from the reaction mixture with an external magnet is an important superiority of these nanocatalysts. [17,18] 11Н-indeno [1,2-b] quinoxalin-2-one is widely used for preparation of diverse derivatives exhibiting a wide range of biological activity. [12][13][14] Nanoparticles such as γ-Fe 2 O 3 can be easily functionalized by linker groups which can fictionalized by a range of different organocatalysts.…”

Preparation, characterization and catalytic application of nano-Fe3O4@SiO2@(CH2)3OCO2Na as a novel basic magnetic nanocatalyst for the synthesis of new pyranocoumarin derivatives

“…In continuation of our efforts to design, synthesis and application of novel nanocatalyst, 20,21 we have immobilized sodium carbonate on silica-coated Fe 3 O 4 magnetic nanoparticles (Fe 3 O 4 @SiO 2 @(CH 2 ) 3 OCO 2 Na) and then investigated its performance as novel strong, recoverable, and stable basic nanocatalyst for synthesis of new pyranocoumarin derivatives.…”