Pinacol → 3-Chloropropenyl-1-boronic acid pinacol ester

Participants

Reaction Steps

A solution of (E)-3-chloroprop-1-enylboronic acid (5 g, 41 mmol), pinacol (4.9 g, 41 mmol), and magnesium sulfate (15 g, 120 mmol) in methylene chloride (100 mL) was stirred at room temperature for 18 h. The reaction mixture was filtered through silica gel and the filter cake was washed with methylene chloride. The filtrate was concentrated to afford the desired product (4.8 g, 60%) as a colorless oil: ESI MS m/z 203 [C9H16BClO2+H]+.

Provenance & Evidence