[CH3:1][C:2]([S@:5]([NH2:7])=[O:6])([CH3:4])[CH3:3].[Br:8][C:9]1[CH:10]=[C:11]([F:17])[C:12]([CH:15]=O)=[N:13][CH:14]=1.C1(C)C=CC(S([O-])(=O)=O)=CC=1.[NH+]1C=CC=CC=1.S([O-])([O-])(=O)=O.[Mg+2]>C(Cl)Cl>[Br:8][C:9]1[CH:10]=[C:11]([F:17])[C:12](/[CH:15]=[N:7]/[S:5]([C:2]([CH3:4])([CH3:3])[CH3:1])=[O:6])=[N:13][CH:14]=1
To a solution of (R)-(+)-2-methyl-2-propanesulfinamide (9.898 g, 81.67 mmol) in CH2Cl2 (160 mL) was added 5-bromo-3-fluoropyridine-2-carbaldehyde (16.66 g, 81.67 mmol), pyridinium p-toluenesulfonate (1.026 g, 4.08 mmol), and magnesium sulfate (49.15 g, 408.3 mmol). The reaction was stirred at room temperature overnight, then filtered through celite and concentrated in vacuo. The residue was subjected to silica gel chromatography eluted with 0 to 10% ethyl acetate in hexanes to provide N-[(1E)-(5-bromo-3-fluoropyridin-2-yl)methylidene]-2-methylpropane-2-sulfinamide that gave proton NMR spectra consistent with theory and a mass ion (ES+) of 307.0 for M+H+ (81Br).
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