反应详情

To a solution of 5-nitro-2-(pyridine-4-yl) benzo[d]oxazole 3 (600 mg, 2.48 mmol) in ethyl acetate/MeOH (10 mL) was added catalytic amount of 10% Pd—C under hydrogen atmosphere and stirred it for 6 h at room temperature and filtered by flash column chromatography (100% ethyl acetate) to afford 5-amino-2-(pyridine-4-yl) benzo[d]oxazole 4 (450 mg, 86%) as a yellow solid. 1H NMR (CDCl3, 400 MHz) δ 6.78 (dd, J1=12 Hz, J2=2.4 Hz, 1H), 7.07 (d, J=2 Hz, 1H), 7.40 (d, J=4.8 Hz, 1H), 8.05 (dd, J1=8 Hz, J2=1.6 Hz, 2H), 8.79 (dd, J1=4 Hz, J2=1.6 Hz, 2H), 3.78 (s, 2H).

1. filtrationfiltered by flash column chromatography (100% ethyl acetate)