Dicyclohexylcarbodiimide → HCID 67694879, compound

Participants

Reaction Steps

0.57 g (2.75 mmol) of dicyclohexylcarbodiimide was portionwise added to a solution of 1.05 g (2.5 mmol) of 4-{N-[2,5-di(benzyloxy)benzoyl]amino}butyric acid (compound of Example 1) in 16 ml of anhydrous methylene chloride at room temperature under stirring. After stirring the solution at the same temperature for 10 minutes 0.54 g (2.75 mmol) of 2-[4-(acetylamino)phenoxy]ethanol and 0.03 g (0.25 mmol) of 4-(N,N-dimethyl-amino)pyridine were added. The reaction mixture was stirred at room temperature for 4 hours, then diluted with methylene chloride and the solid product was filtered. The filtrate was successively washed with 5% acetic acid, 5% sodium hydrogen carbonate solution and water, then dried and evaporated under reduced pressure. The residue was separated by chromatography on a silica gel column by eluating with a 95:5 mixture of chloroform and methanol to obtain 0.82 g (55%) of the aimed product, m.p.: 141°-143° C.

Provenance & Evidence