To an oven dried Argon cooled 100 mL flask, 605 mg acid 6, 493 mg EDCI.HCl, 348 mg of HOBt were added. While under Argon atmosphere, 30 mL of dry DMF and 1.79 mL of Et3N were added and the mixture was stirred at room temperature for 15 min. After this, 389 mg of 1-adamantylamine was added and the resulting mixture was heated at 60° C. with continuous stirring for a period of 16 hrs when TLC indicated the reaction was complete. The mixture was cooled to 0° C. and poured into water. The resulting yellow solid was collected and filtered to give the crude amide that was further purified by chromatography over silica gel using 50–90% ethyl acetate in hexane as eluent. Evaporation of the solvent yielded 600 mg of pure 7.
