General Procedure A: To a solution of N-aryl-tert-butansulfinamide (1.0 equiv.) in THF (0.25 M) was added n BuLi (1.6 M in hexane, 1.2 equiv.) at -78 ℃ under N2. After stirring at this temperature for 30 min, a solution of cinnamyl chloride in THF . After 2 hours, the reaction was quenched with saturated aqueous ammonium chloride solution (5 mL). The reaction mixture was extracted with ethyl acetate .