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General route for the catalytic preparation of thiazolidine-4-ones and N –amino-2-pyridones. [Display omitted] • A new pyridine-based magnetic COF decorated with trifluoroacetate as ionic sections (Fe 3 O 4 @COF-TFA) was designed and constructed. • In a comprehensive study, Fe 3 O 4 @COF-TFA was investigated using FT-IR, EDS, elemental mapping, SEM, TEM, VSM and TGA/DTG analysis. • Fe 3 O 4 @COF-TFA was successfully used as a heterogeneous catalyst for construction of 2,3-disubstituted thiazolidine-4-ones and N –amino-2-pyridones via a multi-component synthetic strategy. The functionalization of magnetic nanoparticles with covalent organic frameworks (COFs) will endow them inspiring characteristics. Herein, a new magnetic covalent organic framework (MCOF) decorated with trifluoroacetate as ionic sections (Fe 3 O 4 @COF-TFA) was designed and constructed. To confirm the successful synthesis of this hybrid material, several techniques including Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), derivative thermogravimetry (DTG), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), elemental mapping, transmission electron microscopy (TEM), vibrating-sample magnetometer (VSM) and X-ray diffraction analysis (XRD) were applied. TG/DTG analyses show that Fe 3 O 4 @COF-TFA has an excellent thermal stability up to 450 ℃. The FE-SEM analysis revealed that catalyst has the island-like morphology and according to TEM analysis, it has spherical geometry with nanometer scale particle size. Also, surface area of Fe 3 O 4 @COF and Fe 3 O 4 @COF-TFA are 74 and 12 m2.g−1, respectively. Fe 3 O 4 @COF-TFA was applied as a recoverable heterogeneous catalyst for construction of 2,3-disubstituted thiazolidine-4-ones and N ‑amino-2-pyridones via a multi-component synthetic strategy. It is worth mentioning that synthesized derivatives have a good yield and short reaction times. [ABSTRACT FROM AUTHOR]

Through task-specific design and synthesis of mesoporous catalysts, we introduce a novel metal–organic framework serving as a heterogeneous catalyst. In this study, Co(BDC-NH(CH 2) 3 SO 3 H was meticulously prepared through the condensation reaction of 1,4-butane sultone and Co(BDC-NH 2) utilizing a post-modification method. The thorough examination of these parameters ensures a detailed understanding of the catalyst's properties. Subsequently, the catalytic activity was explored in the synthesis of chromeno[4,3- d ]pyrimidine derivatives employing a cooperative vinylogous anomeric-based oxidation mechanism. This research not only presents a new and efficient catalyst but also contributes valuable insights into the synthesis of biologically relevant chromeno[4,3- d ]pyrimidine derivatives. [ABSTRACT FROM AUTHOR]