反应详情

(rac)-3-(1-Imidazo[1,2-a]pyridin-6-yl-ethyl)-6-{1-[2-(tetrahydro-pyran-2-yloxy)-ethyl]-1H-pyrazol-4-yl}-imidazo[1,2-b]pyridazine (obtained by analogy of Stage 185.1 by replacing (rac)-6-chloro-3-[1-(3-methyl-3H-benzoimidazol-5-yl)-ethyl]-imidazo[1,2-b]pyridazine with (rac)-6-chloro-3-(1-imidazo[1,2-a]pyridin-6-yl-ethyl)-imidazo[1,2-b]pyridazine (Example 292), 150 mg, 0.328 mmol) was dissolved in DCM (3.3 mL) and NBS (64.2 mg, 0.984 mmol) was added. It was stirred at rt for 3 h then the solvent was removed. The residue was purified by flash chromatography (CombiFlash® Companion System®, with RediSep® silica gel column, 0 to 20% MeOH in DCM). Combined fractions were concentrated and dissolved in DCM (1 mL) with 4 N HCl in dioxane (0.246 mL, 0.984 mmol). The RM was stirred at rt for 2 min. The solvent was removed and the residue was purified by preparative HPLC with acetonitrile and water (+0.1% TFA). The fractions were joined and acetonitrile was removed. The aqueous solution was basified with 5% NaHCO3 solution and was extracted with EtOAc twice. Combined organic layers was washed with brine and dried over Na2SO4. It was filtered to afford after evaporation of the solvent the title compound as a white solid (tR 0.7 min (conditions 2), MH+=452, 1H-NMR in DMSO-d6: 8.46 (s, 1H); 8.40 (s, 1H); 8.04 (m, 2H); 7.78 (s, 1H); 7.67 (s, 1H); 7.52 (m, 2H); 7.33 (d, 1H); 4.95 (t, 1H); 4.76 (q, 1H); 4.18 (t, 2H); 3.75 (q, 2H); 1.80 (d, 3H)).

1. customthe solvent was removed
2. customThe residue was purified by flash chromatography (CombiFlash® Companion System®, with RediSep® silica gel column, 0 to 20% MeOH in DCM)
3. concentrationCombined fractions were concentrated
4. stirringThe RM was stirred at rt for 2 min
5. customThe solvent was removed
6. customthe residue was purified by preparative HPLC with acetonitrile and water (+0.1% TFA)
7. customacetonitrile was removed
8. extractionwas extracted with EtOAc twice
9. washCombined organic layers was washed with brine
10. dry with materialdried over Na2SO4
11. filtrationIt was filtered
12. customto afford
13. customafter evaporation of the solvent the title compound as a white solid (tR 0.7 min (conditions 2), MH+=452, 1H-NMR in DMSO-d6: 8.46 (s, 1H); 8.40 (s, 1H); 8.04 (m, 2H); 7.78 (s, 1H); 7.67 (s, 1H); 7.52 (m, 2H); 7.33 (d, 1H); 4.95 (t, 1H); 4.76 (q, 1H); 4.18 (t, 2H); 3.75 (q, 2H); 1.80 (d, 3H))