Sodium Hydroxide → 8-Bromoisoquinolin-5-amine

Temperature

80 °C

5-Aminoisoquinoline (5.50 g, 38.1 mmol) and aluminium trichloride (15.1 g, 113 mmol) were combined and heated at 80° C. in a 3-necked flask equipped with a dropping funnel, stirrer bar, needle and sintered glass tube. Bromine (3.04 g, 19.05 mmol) was dripped onto the sintered glass funnel and the vapour diffused onto the complex over a period of 2 hours. Heating was continued for 2 hours. The suspension was added portionwise to crushed ice and the solution basified with concentrated NaOH solution. The aqueous layer was extracted with ethyl acetate (4×100 mL) and the layers were separated. The organic layers were combined, dried (Na2SO4), filtered and the filtrate was concentrated to give a grey solid. The grey solid was subjected to column chromatography (hexanes:ethyl acetate, 3:1) to provide the title compound (2.96 g, 35%). MS (ESI+) m/z 225 (M+H)+; MS (ESI−) m/z 223 (M−H)−; 1H NMR (CDCl3, 300 MHz) δ 4.22 (br s, 2H), 6.83 (d, J 8.1, 1H), 7.25 (s, 1H), 7.54 (d, J 5.8, 1H), 7.61 (d, J 8.1, 1H), 8.59 (d, J 5.8, 1H), 9.56 (s, 1H).

1. customequipped with a dropping funnel, stirrer bar
2. temperatureHeating
3. waitwas continued for 2 hours
4. additionThe suspension was added portionwise
5. customto crushed ice
6. extractionThe aqueous layer was extracted with ethyl acetate (4×100 mL)
7. customthe layers were separated
8. dry with materialdried (Na2SO4)
9. filtrationfiltered
10. concentrationthe filtrate was concentrated
11. customto give a grey solid

ORD record

ord-52291a5248c54658b607970eb6ff1e33

Source dataset

uspto-grants-2012_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08247413B2