Nafion-H® catalyzed efficient one-pot synthesis of triazolo[5,1-b]quinazolinones and triazolo[1,5-a]pyrimidines: A green strategy

α-Aminoazoles/azines: key reaction partners for multicomponent reactions

“… 130 The TFA : DIPEA (1 : 1)-catalysed version of this protocol was developed by C. Raju et al utilizing 5-aminotetrazole instead of 3-amino-1,2,4-triazole in a reaction with aromatic aldehyde and dimedone/ethyl acetoacetate, and the synthesized tetrazole-fused compounds were evaluated for their antimicrobial and antioxidant activity. 131 Similarly, other catalysts such as Nafion-H, 132 PEG-400, 133 and NaHSO 4 immobilized on core/shell phenylene-bridged periodic mesoporous organosilica magnetic nanoparticles (γ-Fe 2 O 3 @Ph-PMO-NaHSO 4 ) 134 were used ( Scheme 58 ).…”

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.…”

An Efficient, Green, and Solvent‐free Multi‐component Synthesis of Benzimidazolo/Benzothiazolo Quinazolinone Derivatives Using Sc (OTf)3 Catalyst Under Controlled Microwave Irradiation

“…Several methods for the synthesis of quinazolinone derivatives have been quoted in the literature, for instance, by refluxing in DMF, H 6 P 2 W 18 O 62 ·18H 2 O, NH 2 SO 3 H, dodecylphosphonic acid, C 2 H 5 OH/SA, molecular iodine (I 2 ), ionic liquids, Nafion‐H catalyst in PEG‐400, chitosan‐supported ferrite nanocomposite, silica gel, FeF 3 , p ‐TsOH·H 2 O, Nano‐WO 3 ‐supported sulfonic acid, nanoporous silica (SBA‐Pr‐SO 3 H), succinimidinium hydrogensulfate [H‐Suc]HSO 4 , and [DABCO](SO 3 H) 2 Cl 2 . Every method has its own values and limitations.…”