Sulfonic acid functionalized mesoporous SBA-15 as an efficient and recyclable catalyst for the synthesis of chromenes from chromanols

Heterogeneous Synthesis of Indole-2-Carboxylic Esters Via Bischler Cyclization Under the Catalysis of Sulfonic Acid-Functionalized SBA-15 Silicas

“…Compared with conventional solid acids, such as zeolites, ion exchange resins, heteropoly acids etc., these sulfonated mesoporous silicas have their own unique features, including mesoscopic pores, large surface area, easy accessibility and uniform distribution of the acid sites, as well as excellent chemical and thermal stability. Since their discovery [8,9], sulfonated mesoporous silicas have been successfully applied in acid-catalyzed esterifications [10][11][12][13][14][15][16], condensations [17][18][19][20], etherifications [21][22][23], additions [24,25], rearrangements [26,27], Friedel-Crafts reactions [28,29] and so on [30][31][32][33][34][35][36][37][38][39]. In most cases, these solid acidic materials not only led to more environmentally benign processes, but also exhibited much better catalytic performance than other homogeneous and conventional heterogeneous ones.…”

Sulfonic Acid-Functionalized Lus-1: An Efficient Catalyst for One-Pot Synthesis of 2,4-Diamino Pyrimidine-5-Carbonitrile Derivatives

“…Grafting organo-acidic groups (e.g., propyl sulfonic acid) to the pore walls of the mesoporous silica materials create various heterogeneous acid catalysts for a wide variety of organic reactions. [1][2][3][4][5][6] The LUS-1 is an ordered mesoporous silica with high surface area (800 cm 2 g -1…”

Application of Sulfonic Acid Functionalized Nanoporous Silica (SBA-Pr-SO3H) for One-Pot Synthesis of Quinoxaline Derivatives

“…There are only a few reports about the application of several types of sulfonic acid functionalized ordered mesoporous silicas as nano acid catalyst in chemical transformations (Van Rhijn et al 1998, Das et al 2006. For example, SBA-Pr-SO 3 H has been used in the synthesis of chromenes from chromanols (Kureshy et al 2009), and the von Pechmann Reaction (Karimi et al 2008).…”