反应详情

To round bottom flask, 3-hydroxy-3-methylbutanal (0.178 g, 1.185 mmol) and 6-(2,4-difluorophenyl)-5-(6-hydrazinylpyridazin-3-yl)imidazo[2,1-b]oxazole (0.3 g, 0.859 mmol) and DCM 5 mL were added. The reaction mixture was stirred at about ambient temperature for about 1 h. Iodobenzene diacetate (0.38 g, 1.18 mmol) was added and was stirred at ambient temperature for overnight. The reaction mixture was quenched with water. The aqueous phase was extracted with DCM and the organic layer was concentrated under reduced pressure. The crude material was purified by silica gel chromatography using DCM/MeOH (90:10). After concentration of the fractions with product, the resulting solid was triturated with ether. The solid was collected by filtration then dried under vacuum at about 60° C. for about 2 days to give the title compound (0.118 g, 33.5%): LC/MS (Table 1, Method g) Rt=1.78 min; MS m/z: 411.2 (M+H)+. 1H NMR (DMSO-d6) δ 8.52 (d, 1H), 8.27 (d, 1H), 8.21 (d, 1H), 7.75 (m, 1H), 7.50-7.40 (m, 1H), 7.34-7.25 (m, 1H), 6.90 (m, 1H), 4.71 (s, 1H), 3.33 (s, 2H), 1.27 (s, 6H)

1. stirringwas stirred at ambient temperature for overnight
2. customThe reaction mixture was quenched with water
3. extractionThe aqueous phase was extracted with DCM
4. concentrationthe organic layer was concentrated under reduced pressure
5. customThe crude material was purified by silica gel chromatography
6. customAfter concentration of the fractions with product, the resulting solid was triturated with ether
7. filtrationThe solid was collected by filtration
8. customthen dried under vacuum at about 60° C. for about 2 days