Efficiency of NaHSO4 modified periodic mesoporous organosilica magnetic nanoparticles as a new magnetically separable nanocatalyst in the synthesis of [1,2,4]triazolo quinazolinone/pyrimidine derivatives

Introduction of a New Magnetic Nanocatalyst as an Organic‐inorganic Hybrid Framework for the Synthesis of Pyrano[2,3‐d]pyrimidinone(thione)s and Pyrido[2,3‐d]pyrimidines

“…It has been more than two decades that various catalysts have been designed and introduced for the chemical reactions by our research group that each one at least has a distinguished advantage in comparison with other introduced ones . Among them, nano‐catalysts and nano‐magnetic catalysts are a unique field for our research group . In continuation of these studies and for the first time, here in, we wish to introduce a bis‐dicationic acidic ionic liquid using an aliphatic spacer and its immobilization on silica‐coated magnetic nano γ ‐Fe 2 O 3 for the efficient promotion of the synthesis of pyrano[2,3‐ d ]pyrimidinone (thione) and of pyrido[2,3‐ d ]pyrimidine derivatives.…”

Bi2O3/FAp, a sustainable catalyst for synthesis of dihydro‐[1,2,4]triazolo[1,5‐a]pyrimidine derivatives through green strategy

“…In recent years, there is considerable interest toward the developing synthetic protocols for new dihydropyrimidine scaffolds. Various materials including [DABCO](SO 3 H) 2 (Cl) 2 , [DABCO](SO 3 H) 2 (HSO 4 ) 2 , [H 2 ‐DABCO][ClO 4 ] 2 , thiamine‐HCl, γ‐Fe 2 O 3 @NaHSO 4 nanocatalyst, and Nafion‐H have been explored as catalysts in this regard . Recently, Sumathi and Gopal accomplished Biginelli condensation of dihydropyrimidinone derivatives in a one‐pot approach using bismuth‐substituted FAp [BiNaCa 4 (PO 4 ) 3 F] at reflux condition.…”

Periodic Mesoporous Organosilica Containing Bridged N‐Sulfonic Acid Groups: Promotion of the Synthesis of N,N’‐Diarylformamidines, Benzoxazoles, Benzothiazoles and Benzimidazoles

“…on the other hand, uniform pore size, large pore volume, high surface area, high thermal and mechanical stability are fascinating and unique properties of PMOs making them an excellent candidate for important fields such as ionic exchange, separation, drug‐delivery, preparation of batteries, fuel cells, sensors and chromatography. Furthermore, easy functionalization of the bridged organic groups containing heteroelements (N, S, P, O,…) makes it possible to expand their applications as catalysts, too . Based on the mentioned properties and the advantages of periodic mesoporous organosilica materials and also the importance of sulfonic acid in the preparation of organic products and based on our experiences in the preparation of the similar types of catalysts, we have decided to synthesize and develop a new catalyst which possesses both attractive features of PMOs and sulfonic acid in the same material.…”

“…Furthermore, easy functionalization of the bridged organic groups containing heteroelements (N, S, P, O,…) makes it possible to expand their applications as catalysts, too . Based on the mentioned properties and the advantages of periodic mesoporous organosilica materials and also the importance of sulfonic acid in the preparation of organic products and based on our experiences in the preparation of the similar types of catalysts, we have decided to synthesize and develop a new catalyst which possesses both attractive features of PMOs and sulfonic acid in the same material. To achieve this goal, the preparation of periodic mesoporous organosilica containing bridged N ‐sulfonic acid groups (SA‐PMO) and its performance as the catalyst in the preparation of benzimidazoles, benzoxazoles, benzothiazoles and N,N’ diarylformamidines have been defined as the main aim of this work.…”