Trifluoroacetic acid → 3-(1H-pyrazol-4-yl)-pyridine-2,6-diamine

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To a solution of 3-(1-trityl-1H-pyrazol-4-yl)-pyridin-2,6-diamine (10.0 g, 25.7 mmol) described in Manufacturing Example 36-1-1 in methylene chloride (14 mL) was added trifluoroacetic acid (7 mL) under nitrogen atmosphere, which was stirred for 1 hour at room temperature. The reaction mixture was concentrated under a reduced pressure. The residue was purified by NH silica gel column chromatography (ethyl acetate, then ethyl acetate:methanol=10:1) to obtain the title compound (600 mg, 60%).

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