2-[(4-{5-Oxo-4-[3-(trifluoromethyl)phenyl]-4,5-dihydro-1,2,4-oxadiazol-3-yl}-1,2,5-oxadiazol-3-yl)amino]ethyl methanesulfonate (1.2 g, 2.9 mmol) was dissolved in N,N-dimethylformamide (2.7 mL). After sodium azide (280 mg, 4.3 mmol) was added in one portion, the temperature was brought to 65° C. and the reaction stirred for 6 hours. After cooling back to room temperature, water (10 mL) was added to quench the reaction. The product was extracted with ethyl acetate (3×10 mL) and the combined organic layers were dried over sodium sulfate. The solvent was removed in vacuo to give the desired product (1.05 g, 96%). LCMS calculated for C13H10F3N6O3 (M-N2+H)+: m/z=355.0. 1H NMR (400 MHz, DMSO-d6): δ 8.09 (s, 1H), 7.93 (m, 2H), 7.79 (t, J=8.2 Hz, 1H), 6.75 (t, J=5.8 Hz, 1H), 3.52 (t, J=5.7 Hz, 2H), 3.44 (q, J=5.5 Hz, 2H).
