反应详情

To a solution of 4-(2-methyl-4-nitrophenoxy)pyridin-2-ylamine and triethylamine (500 mg) in tetrahydrofuran (50 ml) was added phenyl chloroformate (0.384 ml, 4.08 mmol) dropwise while stirring in an ice bath, followed by stirring for 0.5 hr. The reaction mixture was concentrated under a reduced pressure to give a residue, to which N,N-dimethylformamide (20 ml) and N,N-diethyl-1,3-propanediamine (1.28 ml) were then added, followed by stirring at room temperature for 2 hrs. The reaction mixture was partitioned between ethyl acetate (150 ml) and water (100 ml). The organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated under a reduced pressure. The resultant residue was purified by silica gel column chromatography (Fuji Silysia NH, eluent; hexane:ethyl acetate=1:1, then ethyl acetate) to provide the titled compound (794 mg, 96.9%) as a pale yellow oil.

1. stirringby stirring for 0.5 hr
2. concentrationThe reaction mixture was concentrated under a reduced pressure
3. customto give a residue
4. stirringby stirring at room temperature for 2 hrs
5. customThe reaction mixture was partitioned between ethyl acetate (150 ml) and water (100 ml)
6. washThe organic layer was washed with brine
7. dry with materialdried over anhydrous sodium sulfate
8. concentrationconcentrated under a reduced pressure
9. customThe resultant residue was purified by silica gel column chromatography (Fuji Silysia NH, eluent