Hydrochloric Acid → 2-(1-((3,5-dimethylisoxazol-4-yl)methyl)-1H-pyrazol-4-yl)isoindolin-1-one

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Reaction Steps

2-((1-((3,5-dimethylisoxazol-4-yl)methyl)-1H-pyrazol-4-ylamino)methyl)benzonitrile (example 9-2) (30 mg, 0.14 mmol) was stirred in a mixture of MeOH/2N aqueous NaOH (5 mL) at 100° C. for 30 minutes in the microwave reactor. The reaction was acidified with 1N aqueous HCl (100 mL) and extracted with ethyl acetate (3×, 70 mL). The combined organic extracts were dried over sodium sulfate and concentrated. The residue was dissolved in MeOH (3 mL) and purified by reversed phase HPLC in 2-1.5 mL aliquots (5 to 95% acetonitrile in H2O: 16 minute gradient). The pure fractions were combined and concentrated to afford 2-(1-((3,5-dimethylisoxazol-4-yl)methyl)-1H-pyrazol-4-yl)isoindolin-1-one (21 mg, 50%) as a pure white solid. 1H NMR (DMSO-d6, 400 MHz): δ2.15 (s, 3H), 2.41 (s, 3H), 4.81 (s, 2H), 5.17 (s, 2H), 7.48-7.50 (m, 1H), 7.51-7.52 (m, 2H), 7.72 (d, J=7.2 Hz, 1H), 7.75 (s, 1H), 8.20 (s, 1H). The title compound was shown to inhibit hT2R08 bitter receptor and had an IC50 of 11 μM.

Provenance & Evidence