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

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Reaction Steps

The title compound was prepared from Methyl 6-(cyclopentylmethylene)-5-oxo-5,6,7,8-tetrahydronaphthalene-2-carboxylate; Preparation 18 (310 mg, 1.09 mmol) and 4-hydrazinyl-2-methoxybenzonitrile hydrochloride; Preparation 4 (282 mg, 1.42 mmol) according to Method B (methanol was used in place of ethanol as solvent) and Method C. The crude precipitate was purified by reverse phase chromatography with 40-95% acetonitrile/water to give the title compound (yellow solid, 220 mg, 0.53 mmol, 49% yield). The title compound was largely present as (±)-(3SR,3aRS)-2-(4-cyano-3-methoxyphenyl)-3-cyclopentyl-3,3a,4,5-tetrahydro-2H-benzo[g]indazole-7-carboxylic acid. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.34 (m, 7H), 1.65-1.90 (m, 2H), 1.99-2.12 (m, 1H), 2.18-2.27 (m, 1H), 2.82-2.95 (m, 1H), 3.04-3.13 (m, 1H), 3.52-3.63 (m, 1H), 3.90 (s, 3H), 4.94 (dd, J=9.67, 5.37 Hz, 1H), 6.80 (dd, J=8.59, 1.88 Hz, 1H), 6.90 (d, J=1.61 Hz, 1H), 7.45 (d, J=8.59 Hz, 1H), 7.81 (dd, J=8.19, 1.48 Hz, 1H), 7.85 (s, 1H), 8.08 (d, J=8.06 Hz, 1H), 13.02 (s, 1H). ES-MS m/z 416 (M+H).

Provenance & Evidence