Tert-Butanesulfinamide → (NE)-N-[(E)-4,4-dimethylpent-2-enylidene]-2-methylpropane-2-sulfinamide

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To a solution of 2-methylpropane-2-sulfinamide (3.08 g, 0.025 mol) in dichloromethane (10 ml) was added CuSO4 (5.42 g, 0.034 mol) followed by (2E)-4,4-dimethylpent-2-enal (Journal of Organic Chemistry 1993, 58(9), 2517-22, 1.9 g, 0.017 mol) in dichloromethane (60 ml). The reaction mixture was stirred at RT overnight under nitrogen and then filtered through a pad of celite. The filtrate was evaporated under reduced pressure and purified by chromatography on silica gel eluting with 10% AcOEt/Hexane to give 2.1 g (58%) of the title compound; 1H NMR δ (ppm)(CDCl3, 400 MHz): 8.19 (1 H, d, J=9.2 Hz), 6.53 (1 H, d, J=15.7 Hz), 6.36 (1 H, dd, J=9.2, 15.7 Hz), 1.21 (9 H, s), 1.12 (9 H, s).

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