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At 0° C., to a solution of 500 mg (1.42 mmol) of compound (4a) and 5 mL of dichloromethane was added very slowly 1 equiv. of m-CPBA over 3 h. Sulfoxide formation was monitored by thin-layer chromatography. Purification was performed with a flash chromatographic column, and an amorphous powder of (4c) was obtained (87% yield). 1H NMR (500 MHz, CDCl3) δ 7.92 (br, 1H), 7.71 (d, 2H), 7.62-7.60 (m, 3H), 7.58-7.40 (m, 4H), 6.94 (s, 2H), 3.79 (s, 3H), 3.74 (s, 6H). MS (ESI) m/z 369.1 (M+H)+.

1. customPurification