Benzyl Bromide → 1-benzyl-4-(1-((3,5-dimethylisoxazol-4-yl)methyl)-1H-pyrazol-4-yl)-2-methyl-1,2,4-triazolidine-3,5-dione

Participants

Reaction Steps

4-(1-((3,5-dimethylisoxazol-4-yl)methyl)-1H-pyrazol-4-yl)-1-methyl-1,2,4-triazolidine-3,5-dione (example 10-64) (785 mg, 2.7 mmol) was dissolved in acetonitrile (50 mL). Triethylamine (1 g, 10 mmol) and benzyl bromide (510 mg, 3 mmol) were added and the reaction was stirred at ambient temperature for 12 hours. The mixture was then concentrated on the rotovap, dissolved in methanol (5 mL) and purified by reversed phase HPLC (5-95% acetonitrile in H2O:25 minute gradient). The pure fractions were pooled and concentrated and the product was recrystallized form ethanol to afford 1-benzyl-4-(1-((3,5-dimethylisoxazol-4-yl)methyl)-1H-pyrazol-4-yl)-2-methyl-1,2,4-triazolidine-3,5-dione (210 mg, 20%) as a white solid. 1H NMR (DMSO-d6, 400 MHz): 2.13 (s, 3H), 2.39 (s, 3H), 3.09 (s, 3H), 4.81 (s, 2H), 5.18 (s, 2H), 7.30-7.35 (m, 5H), 7.76 (s, 1H), 8.18 (s, 1H). MS M+H calculated 381.1; found 381.1. Melting point: 124-126° C. The title compound was shown to inhibit hT2R08 bitter receptor and had an IC50 of 0.02 μM.

Provenance & Evidence