反应详情

3-Methylpyrazole-5-carboxylic acid (70.0 mg, 0.555 mmol), HOBt (85 mg, 0.629 mmol) and PS-carbodiimide (672 mg) were weighed in a glass vial. DCM (4 ml) and DMF (0.4 ml) were added. The mixture was stirred for 10 minutes. 2-(3-(3-methoxy-4-nitrophenyl)-1H-pyrazol-1-yl)ethanamine (97 mg, 0.370 mmol) was added and the mixture was stirred for 24 h. The solids were filtered off. PS-Trisamine (616 mg, 1.849 mmol) was added to the filtrate. The mixture was stirred for 2 h and filtered. The filtrate was concentrated and purified by flash chromatography (gradient of DCM:MeOH) to give 46 mg of the title compound. 1H-NMR (400 MHz; CDCl3): δ 2.35 (s, 3H), 3.92, (m, 2H), 4.05, (s, 3H), 4.40, (t, 2H), 6.57 (s, 1H), 6.61 (d, 1H), 7.31 (s, 1H), 7.40-7.43 (m, 1H), 7.47 (d, 1H), 7.62 (d, 1H), 7.96 (d, 1H), 9.94 (s, 1H).

1. stirringthe mixture was stirred for 24 h
2. filtrationThe solids were filtered off
3. stirringThe mixture was stirred for 2 h
4. filtrationfiltered
5. concentrationThe filtrate was concentrated
6. custompurified by flash chromatography (gradient of DCM:MeOH)