In a 100 mL Schlenk flask, 16 (0.50 g, 1.09 mmol) was dissolved in dry EtOH (12 mL) and allowed to stir on ice. In a 50mL Schlenk flask, NaBH4 (0.35 g, 9.36 mmol) was dissolved in dry EtOH (6 mL) and allowed to stir on ice. The solution containing NaBH4 was cannula transferred into the flask containing 16. The mixture was allowed to react at 0 °C for 1 h, after which the reaction was quenched with degassed water. The product was extracted with hexane, which was then washed once with degassed water (25 mL). The organic layer was dried with anhydrous MgSO4, filtered and the volatile components were removed under reduced pressure to yield the purified product as an off-white gel. Yield: 0.31 g, 69%.