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a Reagents: (a) PtO2, H2, MeOH, 3 h; (b) acetyl chloride, Et3N, CH2Cl2, 0 °C, 1 h; (c) 1 eq. NBS, DMF, room temperature, 1 h for 8g; (d) 2 eq. Br2, AcOH, CH2Cl2, room temperature, 1 h for 8h; (e) 1.1 eq. ICl, AcOH, CH2Cl2, room temperature, 1 h for 8i and 8j.
