Hydrogen Peroxide → HCID 178476548, compound

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Reaction Steps

To a mixture of cis-2-(4-{4-amino-1-[4-(4-methylpiperazino)cyclohexyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl}anilino)-1,3-benzoxazole-5-carbonitrile triacetate (0.18 g, 0.00025 mol) in dioxane (2 mL) were added a 2N aqueous solution of sodium hydroxide (1.25 mL, 0.0025 mol) and water (0.75 mL). The mixture was stirred at room temperature for 2 minutes under the atmosphere of nitrogen before adding 30% hydrogen peroxide solution (0.2 mL). The mixture was refluxed for 5 hours, then stirred at room temperature for 18 hours. More 30% hydrogen peroxide solution (0.2 mL) was added to the mixture before refluxing for additional 6 hours, then stirred at room temperature for 2 days. The organic solvent was removed under reduced pressure, and 5% citric acid solution was added to maintain pH 7. The aqueous layer was removed under reduced pressure, and the crude was purified by RP-HPLC (Hypersilprep HS C18, 8 μm, 250×21.1 mm; 5%-100% over 25 min with 0.1 M ammonium acetate, 21 mL/min) to give cis-2-(4-{4-amino-1-[4-(4-methylpiperazino)cyclohexyl]-1H-pyrazolo[3,4-d]pyrimidin-3-yl}anilino)-1,3-benzoxazole-5-carboxamide triacetate (0.11 g, 0.00015 mol).

Provenance & Evidence