General procedure for the synthesis of 4-chloro-1,3,5-triazin-2-amine from 2,4-dichloro-1,3,5-triazine: 2,4-dichloro-1,3,5-triazine (45 mg, 0.3 mmol) was added to 2 mL of aqueous NH4OH. The reaction mixture was stirred at -20 °C for 10 min, followed by filtration and washing with distilled water. The product was dried to afford 4-chloro-1,3,5-triazin-2-amine (18 mg, 46% yield) as a yellow solid, which could be used in subsequent reactions without further purification. Mass spectrometry (MS) analysis showed m/z: 131.0 ([M + H]+).
