Sulfated Copper Oxide Catalyzed One-Pot Synthesis of<i>N-</i>Fused Benzimidazolo/Benzothiazolo Pyrimidines

Jayashree, Sankaranarayanan; Shivashankar, Kalegowda

doi:10.1080/10406638.2019.1625065

Cited by 3 publications

(2 citation statements)

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“…Product 4a was synthesized with longer reaction times and lower yields in CH 3 CN and in the presence of CuI/Ag 2 CO 3 and sulfated CuO as catalysts under reflux conditions. 46,47 Additionally, the proposed CNT1 performed significantly more efficiently compared to CuO NPs in terms of both reaction time and yield under solvent-free conditions (Table 1, entries 13, and 16). 48 To investigate the applicability of the CNT1 catalyst in the synthesis of imidazo [1,2-a]pyrimidine heterocycles, the model reaction was extended to various aldehydes under optimized conditions (Table 2).…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…In the next step, a comparative study was conducted between the present method and the reported conditions for the synthesis of imidazo[1,2- a ]pyrimidines (Table , entries 14–16). Product 4a was synthesized with longer reaction times and lower yields in CH 3 CN and in the presence of CuI/Ag 2 CO 3 and sulfated CuO as catalysts under reflux conditions. , Additionally, the proposed CNT1 performed significantly more efficiently compared to CuO NPs in terms of both reaction time and yield under solvent-free conditions (Table , entries 13, and 16) …”

Section: Resultsmentioning

confidence: 99%

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Fabrication of Nanoporous 3D Carbon Nitride from Poly(ionic liquid)s for Regiospecific Synthesis of Benzimidazole Frameworks

Safaei Ghomi,

Elyasi,

Najafi

et al. 2024

ACS Appl. Nano Mater.

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The traditional form of carbon nitride materials poses limitations, particularly in catalysis, due to a limited number of active sites and low surface area. In response to these challenges, two porous carbon nitride tubes (CNTs) with diverse properties were designed and fabricated by introducing different poly(ionic liquid)s (PILs) as templates. Imidazolium-based PILs were synthesized with different ion pairs, including halogen (Br) and chiral amino acid (l-phenylalanine). The results indicate that the morphology and properties of CNTs are influenced by the nature of PIL ion pairs. Synthesized CNT, assisted by PIL-Br (designated as CNT1), demonstrated superior characteristics in terms of thermal stability (up to 640 °C), specific surface area (73.5 m2/g), and recoverability (six runs without a significant decrease in reaction yield), which are the key factors of a high-performance catalyst. In the following, CNT architectures were employed as heterogeneous catalysts, and their catalytic efficiencies were compared in the regiospecific synthesis of benzimidazole ring systems. As expected, CNT1 demonstrates superfast synthesis (8–12 min) of various pharmaceutical benzimidazole scaffolds with excellent yields (up to 95%) under ultrasound irradiation. In a groundbreaking achievement, this is the first report that presents the preparation of a superactive catalyst through the integration of two distinct categories of advanced materials, including ionic polymers and graphite carbon nitrides, for regiospecific multicomponent reactions. This study offers a fresh perspective on enhancing the catalytic activity of graphitic carbon nitride by changing ion pairs of PILs for advanced technological applications.

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Section: ■ Results and Discussionmentioning

confidence: 98%