反应详情

To a room temperature solution of (0.7 g, 3.55 mmol) of 3-ethoxy-4-(tert-butylamino)-cyclobut-3-ene-1,2-dione and THF (30 mL) was added (0.73 g, 3.78 mmol) of the 4-fluoro-2-trifluoromethylbenzylamine via a syringe. The resulting mixture was stirred at room temperature for 12 hours. After concentration in vacuo, the resulting white solid was recrystallized from hot acetonitrile to give 0.55 gm (52%) of 3-tert-butylamino-4-(4-fluoro-2-trifluoromethyl-benzylamino)-cyclobut-3-ene-1,2-dione as a white solid: mp 192°-194° C.; 1H NMR (DMSO-d6) δ1.36 (s, 9H), 4.88 (d, 2H) 7.67 (m, 5H) ppm; IR (KBr) 3250, 2900, 1800, 1580, 1530 cm-1 ; MS (m/z) 345 ([M+H]+).

1. concentrationAfter concentration in vacuo
2. customthe resulting white solid was recrystallized from hot acetonitrile