NaHCO3 (5 mL), dried over Na2SO4, filtered, and evaporated under reduced pressure. The resulting solid was recrystallized in EtOAc:MeOH (7:3 v:v) (ca. 20 mL). The solution was left to cool to RT then was placed in the freezer (-20 °C) overnight. The crystals were filtered and washed with Et2O affording 2k ( 465 mg, 1.09 mmol, 51% yield) as colorless crystals. . (One carbon is not resolved). Consistent with reported data. 7