反应详情

温度

60 °C

To a solution of (3R,4R)-tert-butyl 4-methyl-3-(6-tosyl-6H-imidazo[1,5-a]pyrrolo[2,3-e]pyrazin-1-yl)piperidine-1-carboxylate (40 g, 78 mmol) in 1,4-dioxane (160 mL) was added NaOH (1 N aqueous, 157 mL). The mixture was heated at about 60° C. for about 1 h. The mixture was allowed to cool to ambient temperature. The mixture was partitioned with HCl (4 N aqueous, 50 mL) and extracted with DCM (2×300 mL). The combined organic extracts were washed with brine (400 mL), dried over anhydrous Na2SO4, filtered then concd in vacuo. The product was purified on silica gel (330 g) using 1-5% MeOH in DCM to give (3R,4R)-tert-butyl 3-(6H-imidazo[1,5-a]pyrrolo[2,3-e]pyrazin-1-yl)-4-methylpiperidine-1-carboxylate (30 g, 99%): LC/MS (Table 1, Method b) Rt=2.00 min; MS m/z: 356 (M+H)+.

1. temperatureto cool to ambient temperature
2. customThe mixture was partitioned with HCl (4 N aqueous, 50 mL)
3. extractionextracted with DCM (2×300 mL)
4. washThe combined organic extracts were washed with brine (400 mL)
5. dry with materialdried over anhydrous Na2SO4
6. filtrationfiltered
7. customThe product was purified on silica gel (330 g)