[Cl:1][C:2]1[CH:3]=[C:4]([CH:7]=[CH:8][C:9]=1[C:10]([F:13])([F:12])[F:11])[CH:5]=[O:6].[N+:14]([CH:16](S(C1C=CC(C)=CC=1)(=O)=O)[CH3:17])#[C-:15].C([O-])([O-])=O.[K+].[K+]>CO>[Cl:1][C:2]1[CH:3]=[C:4]([C:5]2[O:6][CH:15]=[N:14][C:16]=2[CH3:17])[CH:7]=[CH:8][C:9]=1[C:10]([F:11])([F:12])[F:13]A mixture of Example 45A (2.84 g, 13.6 mmol), 1-(1-isocyanoethylsulfonyl)-4-methylbenzene (2.85 g, 13.6 mmol), and K2CO3 (2.26 g, 16.3 mmol) in MeOH (70 mL) was heated to reflux. After 2 hr the reaction mixture was cooled to ambient temperature, and the volatiles were evaporated at reduced pressure. The residue was partitioned between Et2O and H2O. The separated aqueous layer was extracted with Et2O, and the combined organic phase was washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo. Flash chromatography (Analogix® Intelliflash 280; 10% to 30% EtOAc/hexanes eluant; SF40-150 g column) yielded 3.04 g (85%) of the title compound as a white solid. 1H NMR (300 MHz, DMSO-d6) δ 8.48 (s, 1H), 7.96 (d, J=8.4, 1H), 7.87 (s, 1H), 7.78 (dd, J=8.3, 0.8, 1H), 2.43 (s, 3H). MS (DCI+) m/z 262 (M+H).
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