Br[CH:2]([C:4]1[C:12]([C:13]2[CH:18]=[C:17]([F:19])[CH:16]=[C:15]([F:20])[CH:14]=2)=[C:7]2[CH:8]=[CH:9][CH:10]=[CH:11][N:6]2[N:5]=1)[CH3:3].[N-:21]=[N+:22]=[N-:23].[Na+]>CN(C)C=O.C(OCC)(=O)C>[N:21]([CH:2]([C:4]1[C:12]([C:13]2[CH:18]=[C:17]([F:19])[CH:16]=[C:15]([F:20])[CH:14]=2)=[C:7]2[CH:8]=[CH:9][CH:10]=[CH:11][N:6]2[N:5]=1)[CH3:3])=[N+:22]=[N-:23]2-(1-Bromoethyl)-3-(3,5-difluorophenyl)pyrazolo[1,5-a]pyridine (0.63 g, 1.9 mmol) and sodium azide (0.12 g, 1.9 mmol) were stirred in N,N-dimethylformamide (20 mL) for 1 hour at 20° C. The mixture was diluted with ethyl acetate, washed with water, dried over magnesium sulfate, filtered, concentrated and purified on silica gel with ethyl acetate in hexanes (0-35%) to give the desired compound (0.41 g, 73%). LCMS for C15H12F2N5 (M+H)+: m/z=299.9. 1H NMR (300 MHz, DMSO-d6): δ 8.80 (m, 1 H), 7.72 (m, 1 H), 7.38 (m, 1 H), 7.22 (m, 3 H), 7.02 (m, 1 H), 4.92 (m, 1 H), 1.62 (m, 3 H).
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