Sodium ethanethiolate → 4-(2-(Pyridin-2-yl)-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazol-3-yl)quinolin-7-ol

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To a solution of 7-methoxy-4-(2-pyridin-2-yl-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazol-3-yl)-quinoline (53 mg, 0.16 mmol) in N,N-dimethylformamide (3 mL) at room temperature is added sodium ethanthiolate (133 mg, 1.6 mmol). The solution is refluxed for 4 h, cooled, and concentrated in vacuo. The residue is dissolved in methanol and loaded onto an SCX column. The column is washed with water, methanol, and 7 N ammonia in methanol. The appropriate fraction is concentrated in vacuo to yield the title compound, 28 mg (56%), as a yellow solid.

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