Diisopropylethylamine → [4-Amino-2-[1-(2,5-dimethyl-thiophene-3-sulfonyl)-piperidin-4-ylamino]-pyrimidin-5-yl]-(5-fluoro-2-methoxy-phenyl)-methanone

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Reaction Steps

To a solution of [4-amino-2-(piperidin-4-ylamino)-pyrimidin-5-yl]-(5-fluoro-2-methoxy-phenyl)-methanone (50 mg, 0.145 mmol, Example 59) and diisopropylethylamine (Aldrich, 330 μL, 1.894 mmol) in anhydrous tetrahydrofuran (15 mL) cooled to 5° C., was added a solution of 2,5-dimethyl-3-thiophenesulfonyl chloride (Maybridge, 45.3 mg, 0.218 mmol) in methylene chloride (3 mL). The reaction mixture was stirred at room temperature overnight and then diluted with 50 mL of methylene chloride. The resulting solution was washed with saturated aqueous sodium bicarbonate (2×10 mL), dried over anhydrous magnesium sulfate and concentrated in vacuo. Purification of the crude residue by flash chromatography (Biotage system, KP-Sil™ 32–63 μm, 60 Å silica gel) eluting with 25% ethyl acetate in hexane yielded [4-amino-2-[1-(2,5-dimethyl-thiophene-3-sulfonyl)-piperidin-4-ylamino]-pyrimidin-5-yl]-(5-fluoro-2-methoxy-phenyl)-methanone (69 mg, 92%) as white solids. HR-MS (ES, m/z) calculated for C23H26FN5O4S2 [(M+H)+] 520.1483, observed 520.1494.

Provenance & Evidence