反应详情

A stirred suspension of diamine 248 (1.13 g, 6.76 mmol) and concentrated HCl (5.6 mL, 67 mmol) in water (22 mL) at 0° C., was treated with a solution of NaNO2 (586 mg, 8.5 mmol) in water (10 mL). The mixture was stirred at the same conditions for 3 h, warmed to room temperature, neutralized with a 5% w/v solution of KOH in water and filtered. The solid was washed with cold water and dried to afford title compound 264 (975 mg, 81% yield). 1H NMR: (DMSO) δ (ppm): 9.00 (d, J=1.3 Hz, 1H), 8.39 (dd, J=1.3, 8.8 Hz, 1H), 8.09 (d, J=8.8 Hz, 1H), 4.40 (s, 3H).

1. filtrationfiltered
2. washThe solid was washed with cold water
3. customdried