反应详情

A mixture of 4-(4-{6-[3-(4-tert-butyl-benzoylamino)-phenyl]-imidazo[1,2-a]pyrazin-8-ylamino}-phenyl)-piperazine-1-carboxylic acid tert-butyl ester (15) (2.0 mmol), 1M HCl in diethyl ether (20 mL), and dioxane (60 mL) is stirred at room temperature for 16 hr. Water (100 mL) is added and the pH brought to 11 with 1N NaOH. The mixture is extracted with ethyl acetate (3×80 mL), the extracts washed with water (2×70 mL) and brine (1×70 mL), dried over magnesium sulfate, and concentrated in vacuo. The residue is slurried with diethyl ether and filtered to give 4-tert-butyl-N-{3-[8-(4-piperazin-1-yl-phenylamino)-imidazo[1,2-a]pyrazin-6-yl]-phenyl}-benzamide (16) as a cream solid.

1. extractionThe mixture is extracted with ethyl acetate (3×80 mL)
2. washthe extracts washed with water (2×70 mL) and brine (1×70 mL)
3. dry with materialdried over magnesium sulfate
4. concentrationconcentrated in vacuo
5. filtrationfiltered