反应详情

Benzyl 3-(2-(tert-butoxycarbonyl(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)amino)acetyl)-4-methylpiperidine-1-carboxylate (1.45 g, 2.2 mmol) was stirred in HCl (4 N in 1,4-dioxane, 0.55 mL, 2.2 mmol) at ambient temperature for about 90 min. The solvent was removed under reduced pressure and the residue was neutralized with saturated aqueous NaHCO3. The aqueous phase was extracted with EtOAc (2×20 mL) and the combined organic extracts were washed with brine (16 mL), dried over anhydrous MgSO4, filtered, and concentrated to yield benzyl 4-methyl-3-(2-(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-ylamino)acetyl)piperidine-1-carboxylate (1.23 g, 100%) as a brown amorphous solid: LC/MS (Table 2, Method a) Rt=2.74 min; MS m/z: 562 (M+H)+.

1. customThe solvent was removed under reduced pressure
2. extractionThe aqueous phase was extracted with EtOAc (2×20 mL)
3. washthe combined organic extracts were washed with brine (16 mL)
4. dry with materialdried over anhydrous MgSO4
5. filtrationfiltered
6. concentrationconcentrated