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1-(1-((3,5-dimethylisoxazol-4-yl)methyl)-1H-pyrazol-4-yl)tetrahydropyrimidin-2(1H)-one (example 9-5a) (50 mg, 0.18 mmol) and 60% sodium hydride (8 mg, 0.20 mmol) in DMF (3 mL) were stirred at room temperature for 15 minutes then cooled to 0° C. Benzyl bromide (31 mg, 0.18 mmol) was added to the mixture and allowed to warm up at room temperature then stirred for 2 hours. The reaction was quenched with methanol and concentrated. The reaction was diluted with brine (50 mL) and extracted with dichloromethane (2×, 50 mL). The combined organic extracts were dried over magnesium sulfate, filtered and concentrated on the rotovap. The residue was taken up in dichloromethane (5 mL) and purified by silica column chromotography (100% to 90% dichloromethane in methanol: 30 minute gradient) to afford 1-benzyl-3-(1-((3,5-dimethylisoxazol-4-yl)methyl)-1H-pyrazol-4-yl)tetrahydropyrimidin-2(1H)-one (20 mg, 30%) as a white solid. 1H NMR (DMSO-d6, 400 MHz): δ1.85-1.91 (m, 2H), 2.10 (s, 3H), 2.37 (s, 3H), 3.12 (m, 2H), 3.55 (t, J=5.8 Hz, 2H), 4.48 (s, 2H), 5.05 (s, 2H), 7.22-7.31 (m, 5H), 7.49 (s, 1H), 7.84 (s, 1H). LC/MS; [M+H] calculated for C20H23N5O2; expected 366.19; found 366.15. The title compound was shown to inhibit hT2R08 bitter receptor and had an IC50 of 1.65 μM.

1. temperatureto warm up at room temperature
2. customThe reaction was quenched with methanol
3. concentrationconcentrated
4. additionThe reaction was diluted with brine (50 mL)
5. extractionextracted with dichloromethane (2×, 50 mL)
6. dry with materialThe combined organic extracts were dried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated on the rotovap
9. custompurified by silica column chromotography (100% to 90% dichloromethane in methanol: 30 minute gradient)