To a flame-dried 50-mL round-bottomed flask equipped with a magnetic stir bar was added ketone and). To the reaction mixture was added EtOH (10 mL, 0.5 M). The reaction mixture was allowed to stir at room temperature for 30 minutes before the reaction mixture was concentrated under reduced pressure by rotary evaporation to give crude SI-6 as a colorless solid (954 mg, 89%).