FC(F)(F)[C:3]1[CH:4]=[C:5]([N+:16]([O-])=O)[CH:6]=[CH:7][C:8]=1[S:9][C:10]1[CH:15]=[CH:14]N=CC=1.SC1C=C[N:25]=[CH:24][CH:23]=1.FC1C=CC([N+]([O-])=O)=CC=1C(F)(F)F.C(=O)([O-])[O-].[K+].[K+]>CN(C=O)C.CCOCC.O>[N:25]1[CH:24]=[CH:23][CH:14]=[CH:15][C:10]=1[S:9][C:8]1[CH:3]=[CH:4][C:5]([NH2:16])=[CH:6][CH:7]=1
3-(Trifluoromethyl)-4-(4-pyridinylthio)nitrobenzene: A solution of 4-mercaptopyridine (2.8 g, 24 mmoles), 2-fluoro-5-nitrobenzotrifluoride (5 g, 23.5 mmoles), and potassium carbonate (6.1 g, 44.3 mmoles) in anhydrous DMF (80 mL) was stirred at room temperature and under argon overnight. TLC showed complete reaction. The mixture was diluted with Et2O (100 mL) and water (100 mL) and the aqueous layer was back-extracted with Et2O (2×100 mL). The organic layers were washed with a saturated NaCl solution (100 mL), dried (MgSO4), and concentrated under reduced pressure. The solid residue was triturated with Et2O to afford the desired product as a tan solid (3.8 g, 54%): TLC (30% EtOAc/70% hexane) Rf 0.06; 1H-NMR (DMSO-d6) δ 7.33 (dd, J=1.2, 4.2 Hz, 2H), 7.78 (d, J=8.7 Hz, 1H), 8.46 (dd, J=2.4, 8.7 Hz, 1H), 8.54-8.56 (m, 3H).
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