Methanol → 6-Methoxy-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 mixture of 7-benzyloxy-6-methoxy-4-(2-pyridin-2-yl-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazol-3-yl)-quinoline (17 mg, 0.04 mmol) and 10% palladium on activated carbon (3 mg) in absolute ethanol (2 mL) is added 1,4-cyclohexadiene (100 mg, 1.2 mmol). The mixture is stirred at room temperature for 3 h, treated with methanol (500 μL), and heated at 60° C. for 3 h. The mixture is cooled, filtered, 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, 10 mg (77%), as a yellow solid.

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