1,2-Diamine/2-nitroaniline (0.5 mmol), vicinal diol (1.0 mmol; 1.5mmol for 2-nitroaniline), anhydrous NiBr2/L2(phen) (5 mol%; 3 mol% for 2-nitroaniline), CsOH.H2O (0.375 mmol; 0.2 mmol for 2-nitroaniline) and 2 mL toluene were taken in a pressure tube and sealed it under argon atmosphere. Then, the tube was placed in a preheated oil bath (150 °C) and refluxed for 24 h. The reaction mixture was cooled and 8 mL water was added to the mixture. After that, the organic part was extracted with EA (3x8 mL). The combined organic part was dried over anhydrous Na2SO4 and solvent was evaporated under reducedpressure. The final product was purified by silica gel column chromatographyusing EA/hexane as eluent.
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