Boron trifluoride etherate → 5-Bromo-2-chloro-3-(4-methoxybenzyl)thiophene

Participants

Reaction Steps

To a solution of methanone 2 (2.68 g, 8.08 mmol) in CH2Cl2/CH3CN (20 mL/20 mL) were added triethylsilane (3.9 mL, 24.2 mmol) and boron trifluoride diethyl etherate (3.1 mL, 24.2 mmol) at 0° C. The mixture was warmed up to room temperature slowly and stirred at room temperature for 15 hours. To the mixture was added aq. saturated K2CO3 solution (50 mL) slowly and extracted with EtOAc (50 mL×2). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The residue was purified by silica column chromatography (Biotage) to provide the desired product 3 (2.09 g, 82%).

Provenance & Evidence