Aluminized polyborate-catalysed green and efficient synthesis of polyhydroquinolines under solvent-free conditions

SBA-15 obtained from rice husk ashes wet-impregnated with metals (Al, Co, Ni) as efficient catalysts for 1,4-dihydropyridine three-component reaction

“…[56][57][58][59][60][61] Nevertheless, the preparation of the catalyst is typically an intricate process. On the other hand, Co and Al catalysts are even more scarce, [62][63][64][65][66][67][68][69] and representative examples are summarized in Table 1.…”

Preparation and characterization of graphitic carbon nitride-supported l-arginine as a highly efficient and recyclable catalyst for the one-pot synthesis of condensation reactions

“… Entry R Product Time (min) Mp (°C) Mp (°C, ref.) Yield (%) 1 H 5a 10 217–219 218–220 17 95 2 4-Cl 5b 15 240–242 241–243 17 94 3 4-OH 5c 20 230–232 231–232 14 89 4 4-NO 2 5d 15 239–241 240–242 14 90 5 4-Me 5e 25 254–256 250 32 87 Reaction conditions: benzaldehyde (1 mmol), ethyl acetoacetate (1 mmol), dimedone (1 mmol), and ammonium acetate (1 mmol), g-C 3 N 4 @ l -arginine (20 mg) and ethanol (7 mL) under reflux conditions. …”

“…The product of the initial reaction is dihydropyridine that can later be converted to pyridine. These compounds are an important class of antihypertensive drugs, vasodilators, hypnotic, anti-tumor 13 , 14 , anti-inflammatory 15 , 16 , anti-diabetic, anti-anxiety, anti-mutation, and are known as calcium channel blockers 17 .…”

Aluminized polyborate catalyzed efficient solvent-free synthesis of 1,8-dioxo-decahydroacridines via hantzsch condensation

“…7 The aluminized polyborate catalyst was used in our previous work for the solvent-free green synthesis of various heterocyclic molecules. [8][9][10] In literature several methodologies are been reported for the synthesis of acridinediones among them some are β-CD-mono-SO3H, 11 CdS thin film, 12 MNPs-N-propyl-benzoguanamine-SO3H, 13 AFGONs, 14 GO/CR-Fe3O4, 15 Iron-4 A molecular sieves, 16 MCM-41-Pr-THEIC, 17 Pd/AlO(OH), 18 urease, 19 Fe3O4@SiO2@Ni-Zn-Fe LDH, 20 nano-Fe3O4@SiO2-HBP-FeCl3, 21 citric acid, 22 TEMPO/CuCl2, 23 N-butyl pyridinium heptachlorodialuminate, 24 L-proline, 25 microwave irradiation, 26 Na + -MMT-[bip]-NH2 + HSO4 -, 27 MSrGONCs, 28 phosphate fertilizers, 29 ChCl:urea deep eutectic solvent, 30 Fe3O4@SiO2-Pr-Sulfurol-SO3H MNPs 31 and ultrasound-assisted 32 reaction.…”