[F:1][C:2]([F:23])([F:22])[C:3]1[CH:4]=[C:5]([N:9]2[CH2:14][CH2:13][N:12](C(OC(C)(C)C)=O)[CH2:11][CH2:10]2)[CH:6]=[N:7][CH:8]=1.Cl>O1CCOCC1>[F:22][C:2]([F:1])([F:23])[C:3]1[CH:4]=[C:5]([N:9]2[CH2:14][CH2:13][NH:12][CH2:11][CH2:10]2)[CH:6]=[N:7][CH:8]=1tert-Butyl 4-[5-(trifluoromethyl)pyridin-3-yl]piperazine-1-carboxylate (0.24 g, 0.25 mmol) was treated with a 4.0 M solution of HCl in 1,4-dioxane (7 mL) at room temperature for 1 h and concentrated. The residue was used for next step without further purification. MS calculated for C10H12F3N3: (M+H) 232; found 232.1.
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