Ethanol → 2-(4-cyano-3-methylphenyl)-3-cyclopentyl-3,3a,4,5-tetrahydro-2H-benzo[g]indazole-7-carboxylic acid

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The title compound was prepared from Methyl 6-(cyclopentylmethylene)-5-oxo-5,6,7,8-tetrahydronaphthalene-2-carboxylate; Preparation 18 (310.5 mg, 1.09 mmol) and 4-hydrazinyl-2-methylbenzonitrile hydrochloride; Preparation 2 (265 mg, 1.45 mmol) according to Method B and Method C (hydrolysis conducted at 60° C.). The crude precipitate was purified by reverse phase chromatography with 60-95% acetonitrile/water to give the title compound (yellow solid, 280 mg, 0.563 mmol, 64% yield). The title compound was largely present as (±)-(3SR,3aRS)-2-(4-cyano-3-methylphenyl)-3-cyclopentyl-3,3a,4,5-tetrahydro-2H-benzo[g]indazole-7-carboxylic acid. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.12-1.56 (m, 7H), 1.64-1.74 (m, 1H), 1.76-1.92 (m, J=12.89, 4.30 Hz, 1H), 2.01-2.14 (m, 1H), 2.18-2.29 (m, 1H), 2.41 (s, 3H), 2.81-2.96 (m, 1H), 3.04-3.14 (m, 1H), 3.51-3.63 (m, 1H), 4.89 (dd, J=9.67, 5.37 Hz, 1H), 7.09 (dd, J=8.59, 2.15 Hz, 1H), 7.22 (d, J=1.88 Hz, 1H), 7.52 (d, J=8.59 Hz, 1H), 7.82 (dd, J=8.19, 1.48 Hz, 1H), 7.85 (s, 1H), 8.07 (d, J=8.06 Hz, 1H), 13.01 (s, 1H). ES-MS m/z 400 (M+H).

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