Trifluoroacetic acid → N-(2-chloropyridin-4-yl)-8-(cyclopropylamino)-6-(tetrahydro-2H-thiopyran-4-ylamino)imidazo[1,2-b]pyridazine-3-carboxamide

関与物質

反応手順

A solution of N-(2-chloropyridin-4-yl)-8-(cyclopropyl(4-methoxybenzyl)amino)-6-(tetrahydro-2H-thiopyran-4-ylamino)imidazo[1,2-b]pyridazine-3-carboxamide (27 mg, 0.048 mmol) in DCM (0.5 mL) was treated with TFA (1.0 mL, 12.98 mmol) and stirred at room temperature for 1 hour and then concentrated to dryness. The crude reaction product was dissolved in a small amount of MeOH and purified by reversed phase HPLC (YMC ODS-A 5 um 30×250 mm, 10-90% aqueous methanol containing 0.1% TFA, 25 mL/min, 30 min gradient, monitored at 254 nm). The product (retention time=36.913 minutes) was isolated and lyophilized to dryness to afford N-(2-chloropyridin-4-yl)-8-(cyclopropylamino)-6-(tetrahydro-2H-thiopyran-4-ylamino)imidazo[1,2-b]pyridazine-3-carboxamide (2.9 mg, 8.33%). HPLC Rt=4.481 min (YMC S5 ODS 4.6×50 mm, 10-90% aqueous methanol containing 0.2% H3PO4, 4 min gradient, monitored at 220 nm). [M+H+]=443.9.

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