... Chemical shifts are reported as δ values relative to the solvent peaks (CHCl 3 in CDCl 3 ... The mixture was extracted three times with EtOAc, and the collected organic layers were dried over ... of 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide (EDCI; 1.2 equiv), in a 9 : 1 mixture of ...