An oven-dried Schlenk vacuum tube was charged with 5 (0.70 g, 1.8 mmol) and Pd(dppf)Cl 2 (45.4 mg, 0.055 mmol), then evacuated and backfilled with argon (3×). To the tube, under a positive pressure of argon, was added HBPin (0.80 mL, 5.5 mmol), Et 3 N (0.78 mL, 5.5 mmol), and degassed 1,4-dioxane (7.0 mL). The mixture was degassed by three freeze-pump-thaw cycles and filled with argon. The reaction mixture was heated at 120 • C overnight (silicone oil bath) then cooled to room temperature. The reaction was quenched with methanol and concentrated, then partitioned between water (10 mL) and CH 2 Cl 2 (5 mL). The organic layer was separated and the aqueous layer extracted with