Scope of the reaction^a.

^aReaction conditions: vinyl Epoxides (0.25 mmol), arylboronic esters (2 equiv.), LiO^tBu (2.5 equiv.).

^bSaturated NH₄Cl was added after the reaction was completed.

^c1–2 mL EtOAc was added after the reaction was completed, then stirred at room temperature for 1–4 h.