反应详情

To a 0.08M solution of N-(2-furanylmethyl) 5-nitro-2-(3-chloro-5-pyridyloxy)benzamide (3.7 g, 10 mmol, prepared in Example 35.2) in MeOH was added a 50% aqueous slurry of Raney nickel (˜6 mL). Hydrogen was then bubbled through the resulting solution for one minute. The resulting mixture was stirred at ambient temperature under one atmosphere of hydrogen for 16 hr. The crude reaction mixture was filtered through a pad of Celite® and the filter cake was washed 3× with MEOH. NOTE: Raney nickel is pyrophoric and should always be kept wet with solvent during the filtration. The Raney nickel can be quenched by adding 6M aqueous HCl. The filtrate was concentrated in the presence of benzene to azeotropically remove water. The residue was purified by chromatography (1-3% MeOH in CH2Cl2) to yield 2.6 g (76%) of N-(2-furanylmethyl) 5-amino-2-(3chloro-5-pyridyloxy)benzamide as a pale brown solid.

1. customHydrogen was then bubbled through the resulting solution for one minute
2. customThe crude reaction mixture
3. filtrationwas filtered through a pad of Celite®
4. washthe filter cake was washed 3× with MEOH
5. filtrationshould always be kept wet with solvent during the filtration
6. customThe Raney nickel can be quenched
7. additionby adding 6M aqueous HCl
8. concentrationThe filtrate was concentrated in the presence of benzene to azeotropically remove water
9. customThe residue was purified by chromatography (1-3% MeOH in CH2Cl2)