Hydrochloric Acid → 6-Methyl-N4-(4-nitrophenyl)pyrimidine-2,4-diamine

Participants

Reaction Steps

4-Nitroaniline (B1) [9.22 g, 0.07 mol] and 2-amino-4-chloro-6-methylpyrimidine (E1) (9.30 g, 0.07 mol) were dissolved in 2-ethoxyethanol (330 mL). To the resulting solution were added a few drops of c.HCl, and the resulting mixture was refluxed for 30 min, and then allowed to cool to room temperature overnight. After this time, the reaction mixture was filtered, and the resulting solid was basified by addition of aqueous ammonia solution, and then crystallized from H2O:EtOH to afford amine E2 as an amorphous bright-yellow solid (7.33 g). Concentration of the filtrate, followed by basification and reprecipitation as before, afforded a further quantity (0.78 g, overall yield 51%). 1H NMR [(CD3)2SO]: 2.14 [s, 3H, ArCH3], 6.00 [s, 1H, ArNHAr], 6.37 [s, 2H, ArNH2], 8.00 [ddd, J=10.24, 5.05, 2.96 Hz, 2H, ArH], 8.12 [ddd, J=10.24, 4.95, 2.90 Hz, 2H, ArH], 9.75 [s, 1H, ArH]. LCMS (APCI+): 246 (100%).

Provenance & Evidence