General procedure G for the Dess-Martin oxidation of alcohols to aldehydes. To a solution of the alcohol (0.5 mmol, 1 equiv.) in CH2Cl2, Dess-Martin periodinane (0.6 mmol, 1.2 equiv.) was added slowly at 0 °C. The reaction mixture was stirred at 0 °C until the reaction was completed, which was monitored by TLC. It was filtered and washed with sat. Na2S2O3 solution (2 × 20 mL), sat. NaHCO3 solution (2 × 20 mL) and brine (1 × 20 mL). The organic phase was dried over Na2SO4 and concentrated under reduced pressure to dryness. The residue was purified by flash column chromatography to afford the aldehyde.