1,8-Diazabicyclo(5.4.0)undec-7-ene → 4-(4-Nitronaphthalen-1-yloxy)pyridin-2-amine

To a stirred suspension of 2-aminopyridin-4-ol (53.9 g, 489 mmol) in acetonitrile (500 mL) was added DBU (102 mL, 678 mmol) dropwise over 30 min. The resulting solution was stirred at RT for 30 min and was then treated dropwise with a solution of 1-fluoro-4-nitronaphthalene (72.0 g, 377 mmol) in acetonitrile (400 mL) over 50 min. After stirring overnight at RT the reaction was heated at 50° C. for 2 hr. The reaction was removed from the heat, but not cooled and with stirring, treated with water (6×100 mL). The mixture was allowed to cool to RT over 2 hr and was then cooled further to 0° C. The yellow precipitate was collected by filtration and washed sequentially with a mixture of water and acetonitrile (1:1, 2×100 mL) and then with water (500 mL) to give the title compound as a yellow solid (76.0 g, 70%): m/z 283 (M+H)+ (ES+).

1. stirringAfter stirring overnight at RT the reaction
2. temperaturewas heated at 50° C. for 2 hr
3. customThe reaction was removed from the heat
4. temperaturenot cooled
5. stirringwith stirring
6. additiontreated with water (6×100 mL)
7. temperatureto cool to RT over 2 hr
8. temperaturewas then cooled further to 0° C
9. filtrationThe yellow precipitate was collected by filtration
10. washwashed sequentially with a mixture of water and acetonitrile (1:1, 2×100 mL)

ORD record

ord-3953d19df2414d13b64cbabf2887eec0

Source dataset

uspto-grants-2012_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08299074B2