反应详情

To a solution of 4-(2-methyl-4-nitrophenoxy)pyridin-2-ylamine (1.00 g) in tetrahydrofuran (50 ml) was added triethylamine (1.14 ml), and then phenyl chloroformate (0.768 ml) was added dropwise thereto while stirring in an ice bath, followed by stirring for 1.5 hrs. Phenyl chloroformate (0.252 ml) was further added thereto 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 pyrrolidine (1.36 ml) were added, followed by stirring at room temperature for 0.5 hr. The reaction mixture was partitioned between ethyl acetate (150 ml) and water (100 ml). The organic layer was washed with brine, and dried over anhydrous sodium sulfate. The solvent was evaporated to give a residue, which was purified by silica gel column chromatography (Fuji Silysia NH, eluent; hexane:ethyl acetate=2:1 to 1:1, then ethyl acetate) to provide the titled compound (988 mg, 70.7%) as a pale yellow solid.

1. stirringby stirring for 1.5 hrs
2. stirringwhile stirring in an ice bath
3. stirringby stirring for 0.5 hr
4. concentrationThe reaction mixture was concentrated under a reduced pressure
5. customto give a residue
6. stirringby stirring at room temperature for 0.5 hr
7. customThe reaction mixture was partitioned between ethyl acetate (150 ml) and water (100 ml)
8. washThe organic layer was washed with brine
9. dry with materialdried over anhydrous sodium sulfate
10. customThe solvent was evaporated
11. customto give a residue, which
12. customwas purified by silica gel column chromatography (Fuji Silysia NH, eluent