反应详情

温度

90 °C

1.300 g (5.940 mmol) 3-bromo-4-nitro-pyridine-1-oxide and 0.980 g (7.430 mmol) 3-pyrrolidin-1-yl-propylamine was added to a suspension of 0.820 g (5.940 mmol) potassium carbonate in 20 mL DMF and the mixture was stirred for 3 hours at 90° C. The solvent was evaporated i. vac. and the residue purified by column chromatography (Alox (neutral, activity II-III), gradient dichloromethane/MeOH 100:0→95:5 v/v) (0.950 g, 60% of theory). 0.900 g (3.380 mmol) of the intermediate product was added to a suspension of 300 mg Pd/C in 10 mL EtOH and the mixture was hydrogenated for 4.5 hours at RT and 50 psi H2-pressure. The catalyst was removed by filtration and the filtrate evaporated i. vac. The product is present in admixture with the corresponding pyridine-N-oxide and was used in the next reaction step without any further purification.

1. customThe solvent was evaporated i
2. customand the residue purified by column chromatography (Alox (neutral, activity II-III), gradient dichloromethane/MeOH 100:0→95:5 v/v) (0.950 g, 60% of theory)
3. waitthe mixture was hydrogenated for 4.5 hours at RT
4. customThe catalyst was removed by filtration
5. customthe filtrate evaporated i
6. customwas used in the next reaction step without any further purification