To a flame-dried microwave vial equipped with a magnetic stir bar was added THF (1.0 mL 0.5 M) and diisopropylamine (91 μL, 0.65 mmol, 1.3 equiv). The reaction mixture was cooled to 0 °C by transferring the reaction apparatus to an ice-water bath. The reaction mixture was stirred for 10 minutes at 0 °C, before n-BuLi (0.24 mL, 0.6 mmol, 1.2 equiv, 2.5 M in hexanes) was added dropwise to the reaction. After stirring for 15 minutes at 0 °C, Bu3SnH (0.16 mL, 0.24 mmol, 1.2 equiv) was added to the reaction mixture. After the reaction mixture was stirred at 0 o C for an additional 30 minutes, a yellow reaction mixture formed. To the reaction mixture was added 5-2 (55.1 mg, 0.5 mmol, 1.0 equiv) dropwise and the resulting mixture was stirred at 0 °C for 30 minutes.