反应详情

温度

55 °C

tert-Butyl 3-hydroxyazetidine-1-carboxylate (4.0 g) and pyridin-4-ol (1.8 g) were mixed with THF (50 ml), and triphenylphosphine (6.23 g) was added thereto. A 1.9 M DIAD/toluene solution (12.5 ml) was added dropwise, followed by stirring at 55° C. overnight. Triphenylphosphine (5 g) and a 1.9 M DIAD/toluene solution (10 ml) were added to the reaction mixture, followed by stirring at 55° C. overnight. The reaction mixture was concentrated under reduced pressure, and a liquid separation operation was carried out by the addition of EtOAc and 0.5 M hydrochloric acid. The aqueous layer was adjusted to a pH of around 10 by the addition of a 4 M aqueous NaOH solution, and extracted with CHCl3. The organic layer was dried over Na2SO4 and concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (CHCl3/MeOH) to obtain tert-butyl 3-(pyridin-4-yloxy)azetidine-1-carboxylate (4.2 g).

1. additionwas added
2. stirringby stirring at 55° C. overnight
3. concentrationThe reaction mixture was concentrated under reduced pressure
4. customa liquid separation operation
5. additionwas carried out by the addition of EtOAc and 0.5 M hydrochloric acid
6. additionThe aqueous layer was adjusted to a pH of around 10 by the addition of a 4 M aqueous NaOH solution
7. extractionextracted with CHCl3
8. dry with materialThe organic layer was dried over Na2SO4
9. concentrationconcentrated under reduced pressure
10. customThe obtained residue was purified by silica gel column chromatography (CHCl3/MeOH)