反应详情

To a solution of 2-(2,4-difluorophenyl)-8-methyl-3-(2-methylsulfanylpyrimidin-4-yl)-imidazo[1,2-a]pyrazine (5.26 g, ˜75% pure, 10.7 mmol) in DCM (90 mL) and MeOH (90 mL) was added a solution of Oxone® (13.1 g, 21.4 mmol) in water (45 mL). After about 16 h, the mixture was diluted with water (250 mL) and extracted with DCM (3×200 mL). The combine organic layers were washed with brine (100 mL), dried over MgSO4, filtered, and concentrated. The crude material was purified by silica gel chromatography using a step-wise gradient of DCM:EtOAc (3:1 to 3:2 to 1:1). Fractions enriched in product were crystallized from hot ACN. The resulting solid was filtered, washing with additional ACN, and dried in a vacuum oven at about 70° C. for about 2 h to give 1.19 g (28%) of the title compound. Additional product can be obtained from further purification of column fractions and filtrate: LC/MS (Table 1, Method b) Rt=1.77 min; MS m/z: 402.1 (M+H)+.

1. extractionextracted with DCM (3×200 mL)
2. washThe combine organic layers were washed with brine (100 mL)
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated
6. customThe crude material was purified by silica gel chromatography
7. customwere crystallized from hot ACN
8. filtrationThe resulting solid was filtered
9. washwashing with additional ACN
10. customdried in a vacuum oven at about 70° C. for about 2 h