Sodium Hydroxide → 2-(4-cyano-3-methylphenyl)-3-cyclopentyl-3,3a,4,5-tetrahydro-2H-pyrazolo[3,4-f]quinoline-7-carboxylic acid

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Reaction Steps

In a dried reaction flask, the crude methyl 2-(4-cyano-3-methylphenyl)-3-cyclopentyl-3,3a,4,5-tetrahydro-2H-pyrazolo[3,4-f]quinoline-7-carboxylate (0.682 g, about 1.5 mmol) and 10% aqueous NaOH solution (1.97 mL, 4.925 mmol) were dissolved in methanol (3 mL) and tetrahydrofuran (8 mL). The reaction solution was stirred at room temperature for 6 hr. The reaction solution was concentrated at a reduced pressure to reduce the volume to half. The residue was adjusted with 1 M HCl under an ice bath to a pH value of 5-6, and filtered to obtain a crude brick red solid, which was then washed with methanol, ethanol and ethyl acetate to produce a solid (0.216 g) in 36.0% yield.

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