反应详情

A mixture of 2-chloro-3-(2-(methylthio)benzo[d]thiazol-6-yl)propanal from Step 4 of Example 117 (1.5 g, 5.5 mmol) and 6-chloropyridazin-3-amine (1.4 g, 11 mmol) in 1-butanol (60 mL) was heated at reflux overnight. Then the mixture was cooled to rt and water (120 mL) was added. The mixture was extracted with EtOAc (60 mL×3). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 50:1 to 20:1 DCM/MeOH to afford 6-((6-chloroimidazo[1,2-b]pyridazin-3-yl)methyl)-2-(methylthio)benzo[d]thiazole as a yellow solid (1.6 g, 84%). 1H NMR (300 MHz, CDCl3) δ 7.89 (d, J=9.6 Hz, 1H), 7.81 (d, J=8.4 Hz, 1H), 7.68 (dd, J=0.6, 1.2 Hz, 1H), 7.53 (s, 1H), 7.37 (dd, J=1.8, 8.4 Hz, 1H), 7.03 (d, J=9.3 Hz, 1H), 4.40 (s, 2H), 2.78 (s, 3H). LCMS (ESI) m/z 347 (M+H)+.

1. temperaturewas heated
2. temperatureat reflux overnight
3. extractionThe mixture was extracted with EtOAc (60 mL×3)
4. washThe combined organic layers were washed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified by silica gel chromatography
9. washeluting with 50:1 to 20:1 DCM/MeOH