Subsequently, diphenyl phosphoryl chloride (1.2 equiv.) and Et3N (1.2 equiv.) were added dropwise. The reaction mixture was allowed to warm to room temperature over a period of 1 hour. Following this time, the reaction mixture was diluted with CH2Cl2, transferred to a separatory funnel, and washed with one portion of 0.2 M aqueous HCl solution. The organic layer was collected, dried over MgSO4, and concentrated under reduced pressure. The resulting residue was purified by chromatography on silica gel (specific conditions are associated with each compound).