反应详情

After 2-amino-4-(4-nitrophenoxy)pyridine (160 mg) was dissolved in tetrahydrofuran (7 ml) under a nitrogen atmosphere, triethylamine (0.289 ml) and phenyl chloroformate (0.260 ml) were added while stirring in an ice water bath. The reaction mixture was allowed to warm up to room temperature and stirred for 1 hr. The reaction mixture was partitioned between ethyl acetate (200 ml) and a saturated aqueous solution of sodium hydrogencarbonate (50 ml). The separated organic layer was washed with a saturated aqueous solution of sodium hydrogencarbonate (50 ml), water (50 ml) and brine (100 ml) in this order, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure, and to the resultant residue was added N,N-dimethylformamide (8 ml). 4-(Pyrrolidin-1-ylmethyl)piperidine dihydrochloride (668 mg) and triethylamine (0.772 ml) were added and stirred for 4 hr. The reaction mixture was partitioned between ethyl acetate (100 ml) and a saturated aqueous solution of ammonium chloride (50 ml). The separated organic layer was washed with a saturated aqueous solution of ammonium chloride (50 ml), water (50 ml) and brine (50 ml) in this order, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure, and the resultant residue was purified by silica gel column chromatography (Fuji Silysia NH, eluent; heptane:ethyl acetate=1:1, then ethyl acetate). Fractions containing the target compound were concentrated under reduced pressure to provide a crude product of 4-(pyrrolidin-1-ylmethyl)piperidine-1-carboxylic acid [4-(4-nitrophenoxy)pyridin-2-yl]amide (295 mg) as a pale yellow oil. 4-(Pyrrolidin-1-ylmethyl)piperidine-1-carboxylic acid [4-(4-nitrophenoxy)pyridin-2-yl]amide (295 mg) was dissolved in tetrahydrofuran (7 ml) and methanol (7 ml) under a nitrogen atmosphere, 10% palladium on carbon (147 mg) was added and stirred under a hydrogen atmosphere for 10 hr. The atmosphere in the reaction vessel was replaced with nitrogen, and the catalyst was removed by filtration and washed with methanol. The filtrate was concentrated under reduced pressure. The resultant residue was purified by silica gel column chromatography (Fuji Silysia NH, eluent; ethyl acetate), and fractions containing the target compound were concentrated under reduced pressure to provide the titled compound as white foam (233.7 mg).

1. customthe catalyst was removed by filtration
2. washwashed with methanol
3. concentrationThe filtrate was concentrated under reduced pressure
4. customThe resultant residue was purified by silica gel column chromatography (Fuji Silysia NH, eluent; ethyl acetate), and fractions
5. additioncontaining the target compound
6. concentrationwere concentrated under reduced pressure