反应详情

1-(3-(4-Nitrophenyl)azetidin-1-yl)propan-1-one (3.16 g, 13.49 mmol) was dissolved in ethanol (200 ml) and SnCl2.2H2O (15.20 g, 67.45 mmol) was added. The resulting mixture was refluxed for 8 h and then the solvent was removed under vacuum. The raw material was dissolved in ethyl acetate and washed successively with 2N aqueous NaOH (×2) and water. The organic layer was dried (Na2SO4), filtered through a pad of celite and evaporated. The crude 1-[3-(4-amino-phenyl)-azetidin-1-yl]-propan-1-one was then dissolved in tetrahydrofuran (THF) (200 ml) and 1M LiAlH4 in tetrahydrofuran (19.5 ml, 19.5 mmol) was added dropwise at 0° C. After stirring at room temperature for 2 h, the reaction mixture was carefully quenched with THF/H2O 9:1 (20 ml) at 0° C., then filtered through a pad of celite and the solvents were removed under reduced pressure. The crude 4-(1-propyl-azetidin-3-yl)-phenylamine was used without any further purification for the next step.

1. temperatureThe resulting mixture was refluxed for 8 h
2. customthe solvent was removed under vacuum
3. dissolutionThe raw material was dissolved in ethyl acetate
4. washwashed successively with 2N aqueous NaOH (×2) and water
5. dry with materialThe organic layer was dried (Na2SO4)
6. filtrationfiltered through a pad of celite
7. customevaporated
8. dissolutionThe crude 1-[3-(4-amino-phenyl)-azetidin-1-yl]-propan-1-one was then dissolved in tetrahydrofuran (THF) (200 ml)
9. customthe reaction mixture was carefully quenched with THF/H2O 9:1 (20 ml) at 0° C.
10. filtrationfiltered through a pad of celite
11. customthe solvents were removed under reduced pressure
12. customThe crude 4-(1-propyl-azetidin-3-yl)-phenylamine was used without any further purification for the next step