Synthesis of a 3D-network polymer supported Bronsted acid ionic liquid based on calix[4]resorcinarene via two post-functionalization steps: a highly efficient and recyclable acid catalyst for the preparation of symmetrical bisamides

Abstract

We report a straightforward route for the synthesis of a novel functional polymer bearing ionic liquid as an efficient and green acidic catalyst for the preparation of bisamides.

Synthesis of 2-aroylfuran and novel 3,5-diaroyl-4-arylisoxazole derivatives by ring contraction of pyrylium salts

“…In continuation of our systematic research on the reactions of pyrylium and thiopyrylium salts [26][27][28][37][38][39][40][41][42], reactions between triarylpyrylium perchlorates and sodium nitrite were investigated. Nucleophilic reaction of triarylpyrylium salts with sodium nitrite in the presence of a variety of organic solvents, for example ethanol, acetonitrile, dichloromethane, and toluene, among others, resulted in mixtures of compounds in poor yields, in agreement with previously reported research [45].…”

“…Because of the importance of both the isoxazole and furan structures, and in continuation of our efforts to develop new synthetic methods for promising molecules [26][27][28][37][38][39][40][41][42], we report, for the first time, a new, highly practical, and eco-friendly approach for synthesis of novel 3,5-diaroyl-4-arylisoxazole 2 and 2-aroylfuran 3 derivatives by novel ring contraction of readily available triarylpyrylium salts 1 with sodium nitrite in the presence of 1-n-butyl-3-methylimidazolium bromide, [bmim]Br, as promoter and efficient reaction medium (Scheme 1).…”

Design and synthesis of a new porous organic polymer equipped with N‐propyl sulfamic acid functionalities: As an efficient heterogeneous catalyst for the synthesis of 1,8‐dioxo‐octahydroxanthene derivatives

“…The ability of these systems for being incorporated to various substrates like neutral molecules, cations, and also linking agents make them known as appropriate candidates in heterogeneous catalysis [11][12][13]. In this regard, special attention has been given to the cross-linked polymers based on calix [4]resorcinarene by this research group [13][14][15][16][17][18] as a proper porous material capable of undergoing the post-functionalization process. This nanoporous polymeric structure consisting of calix [4]resorcinarene monomeric units provides a proper bed for the reaction precession.…”

The synthesis of metal–organic framework Al‐MIL‐53‐derived Brønsted acid catalyst and its application in the Mannich reaction

“…A more efficient and recyclable catalyst would be ideal for more practical Mannich‐type reactions. Several strong heterogeneous Brønsted acid catalysts, such as an MCM‐41‐supported catalyst and a polymer‐supported catalyst, have been reported in the literature. However, these developed heterogeneous catalysts have several drawbacks, such as low surface area and difficult structure elucidation, preventing their practical application.…”