反应详情

温度

110 °C

H3PO2 (28.8 mL of a 50% aqueous solution, 263 mmol) was added to a solution of (rac)-(6-chloro-imidazo[1,2-b]pyridazin-3-yl)-quinolin-6-yl-methanol (Stage 1.1, 10.89 g, 35.0 mmol) in acetic acid (272 mL) at 80° C. Iodine (13.34 g, 52.6 mmol) was then added and the RM was stirred at 110° C. for 90 min. The RM was cooled down to rt and acetic acid was removed. The residue was taken up in water and DCM. A 2 N NaOH solution was then added until pH=11. The organic layer was then separated and washed with water (2×). The aqueous layer was further extracted with DCM (3×). The combined organic layer was then dried, filtered and concentrated. The residue crystallized in EtOAc. The resulting solid was purified by flash chromatography (Flashmaster, with a 50 g silica gel column, TBME/MeOH: 97:3→84:16). The solid crystallized again in EtOAc/Et2O. It was filtered and dried under vacuum to afford the title compound as a white solid (tR 4.72 min (conditions 4), MH+=295.0, 1H-NMR in DMSO-d6: 8.86 (m, 1H); 8.30 (m, 1H); 8.23 (d, 1H); 7.98 (d, 1H); 7.82 (m, 1H); 7.72 (m, 2H); 7.50 (dd, 1H); 7.35 (d, 1H); 4.52 (s, 2H)).

1. temperatureThe RM was cooled down to rt
2. customacetic acid was removed
3. additionA 2 N NaOH solution was then added until pH=11
4. customThe organic layer was then separated
5. washwashed with water (2×)
6. extractionThe aqueous layer was further extracted with DCM (3×)
7. customThe combined organic layer was then dried
8. filtrationfiltered
9. concentrationconcentrated
10. customThe residue crystallized in EtOAc
11. customThe resulting solid was purified by flash chromatography (Flashmaster
12. customThe solid crystallized again in EtOAc/Et2O
13. filtrationIt was filtered
14. customdried under vacuum