A solution of 5-bromo-4-(4-cyclopropylnaphthalen-1-yl)-4H-1,2,4-triazole-3-thiol (100 mg, 0.289 mmol), ethyl 1-bromocyclobutanecarboxylate (47 μL, 0.289 mmol) and diisopropylethylamine (15 μL, 0.866 mmol) in DMF (1 mL) was heated at 60° C. for 4 days. After cooling to room temperature, the mixture was concentrated and partitioned between dichloromethane (15 mL) and HCl (1N aqueous, 15 mL). The aqueous layer was extracted with dichloromethane (2×15 mL) and the combined organic extracts dried over sodium sulfate, concentrated and purified by column chromatography (40% EtOAc/hexanes) to provide ethyl 1-(5-bromo-4-(4-cyclopropylnaphthalen-1-yl)-4H-1,2,4-triazol-3-ylthio)cyclobutanecarboxylate as a light yellow sticky foam (75 mg, 55% yield).
