2-Fluoro-5-nitrobenzotrifluoride → 1-(Methylsulphonyl)-4-nitro-2-(trifluoromethyl)benzene

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Reaktionsschritte

A mixture of 2-fluoro-5-nitro-benzotrifluoride (0.50 g, 2.4 mmol) and sodium methanesulfinate (0.25 g, 2.4 mmol) in anhyd DMF (1.0 mL) was heated at 120° C. with stirring. After 18 h the reaction mixture was cooled, concentrated and chromatographed (silica, EtOAc/Hex, 0:100 to 40:60) to give 2-methanesulfonyl-5-nitro-benzotrifluoride (0.41 g, 64%) as a white solid: 1H-NMR (CDCl3) δ 8.76 (1H, d, J=2.0), 8.62 (1H, dd, J=2.0, 8.8), 8.57 (1H, d, J=8.8), 3.26 (3H, s). The title compound was prepared from 2-methanesulfonyl-5-nitro-benzotrifluoride in a manner similar to that described in Example 3A: 1H-NMR (DMSO-d6) δ 10.14 (1H, s), 8.50 (1H, d, J=2.0), 8.35 (1H, dd, J=2.0, 8.6), 8.16 (1H, d, J=8.8), 8.02 (1H, d, J=7.8), 7.92 (1H, app t, J=7.8), 7.82 (1H, app t, J=7.8), 7.52 (1H, d, J=7.8), 6.69 (1H, s), 3.26 (3H, s), 2.15 (3H, s), 1.89 (3H, s); MS (ESI): 505 (MH+). B. In a manner similar to that described for Example 5A, the following compound was prepared by replacing 2-fluoro-5-nitro-benzotrifluoride with 3-chloro-4-fluoro-nitrobenzene:

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