After stirring at 80 °C for 15 hours, the reaction vessel was removed from the oil bath and allowed to cool to room temperature. Once at room temperature, the reaction mixture was diluted with water (5 mL) and EtOAc (5 mL). The layers were separated, and the aqueous layer was extracted with EtOAc (3 x 5 mL). The combined organic extracts were washed with brine (5 mL), dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure by rotary evaporation to give a yellow solid. Trituration of the yellow solid with Et2O (5 mL) cooled to 0 °C, resulted in the formation of a white solid, which was filtered and dried under vacuum to reveal 10-1 (13.6 mg, 92%) as a colorless solid.