[CH3:1][C:2]1[N:6]=[CH:5][NH:4][N:3]=1.F[C:8]1[CH:13]=[C:12]([F:14])[C:11]([N+:15]([O-:17])=[O:16])=[CH:10][C:9]=1[O:18][CH3:19].C(=O)([O-])[O-].[K+].[K+].O>CS(C)=O>[F:14][C:12]1[C:11]([N+:15]([O-:17])=[O:16])=[CH:10][C:9]([O:18][CH3:19])=[C:8]([N:4]2[CH:5]=[N:6][C:2]([CH3:1])=[N:3]2)[CH:13]=1
Step B (1): A mixture of 3-methyl-1H-1,2,4-triazole (2.20 g, 26.4 mmol), 1,5-difluoro-2-methoxy-4-nitrobenzene (5.00 g, 26.4 mmol), and potassium carbonate (3.65 g, 26.4 mmol) in anhydrous DMSO (50 mL) was heated at 80° C. for 24 h. The reaction mixture was allowed to cool to rt and was poured into 500 mL of water/10 mL brine solution. The aqueous mixture was extracted with EtOAc (2×250 mL). The combined organic extracts were washed with water (500 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. The crude reaction mixture was purified using silica gel column chromatography (50% EtOAc/hexane) to afford 1-(5-fluoro-2-methoxy-4-nitrophenyl)-3-methyl-1H-1,2,4-triazole (1.24 g, 18% yield). LC-MS (M+H)+=253.2. 1H NMR (500 MHz, chloroform-d) δ ppm 8.95 (s, 1 H) 8.00 (d, J=11.60 Hz, 1 H) 7.80 (d, J=6.10 Hz, 1 H) 4.09 (s, 3 H) 2.50 (s, 3 H).
Wird geladen…
