*2.3. The Synthesis of N-Pyridinyl Benzamide*

In a typical catalytic experiment, *trans*-β-nitrostyrene (**1a**, 0.2 mmol, 0.0298 g) and 2-aminopyridine (**2a**, 0.2 mmol, 0.0188 g) in dichloromethane (DCM) solvent (1 mL) in the presence of Fe2Ni-BDC were added into the pressure equipment. The reaction mixture was stirred at 80 ◦C for 24 h in atmospheric air (Table S1). Following this stage, the compound was cooled down to room temperature. The anticipated products were isolated using column chromatography. GC-MS, <sup>1</sup>H NMR, and <sup>13</sup>C NMR analyses were employed to determine the product structure (Supplementary Materials). To assess the recovery and reusability of the catalyst, the catalyst was separated and washed thoroughly with large amounts of ethanol, dried at 100 ◦C, and reused for further experiments.
