Methanol → N-[5-(3-amino-4-chlorophenoxy) [1,3]thiazolo[5,4-b]pyridin-2-yl]cyclopropanecarboxamide

Participants

Reaction Steps

Sodium borohydride (5.63 g, 149 mmol) was suspended in ethanol (100 mL), and methanol (66 mL) was slowly added. To the obtained reaction mixture was added N-(5-{4-chloro-3-[(trifluoroacetyl)amino]phenoxy}[1,3]thiazolo[5,4-b]pyridin-2-yl)cyclopropanecarboxamide (3.4 g, 7.44 mmol) powder in a small portions under cooling in a water bath, and then, the mixture was stirred at room temperature for 1 hr. The reaction mixture was diluted with ethyl acetate (150 mL), and partitioned with water (200 mL), and the organic layer was concentrated under reduced pressure. The residue was diluted with ethyl acetate (200 mL), washed with saturated brine (100 mL), the organic layer was dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by basic silica gel column chromatography (ethyl acetate/methanol=100/0), and triturated with diisopropyl ether to give the title compound (2.00 g, 75%) as a white solid.

Provenance & Evidence