反应详情

To a solution of J-COOH (e.g., naphthylacetic acid) and HOAt (1 equiv) in dry N,N-dimethylformamide was added 1-(3-dimethylaminopropyl)-3-ethylcarbodimide hydrochloride (1 equiv). After the mixture was stirred at room temperature for one-half hour, a chiral amino alcohol (e.g., (R)- or (S)-1-amino-2-propanol or (R)- or (S)-2-amino-1-propanol, affording a methyl group at R5 or R4, respectively) (1 equiv) was added. The reaction was continued for 16 hours. The reaction mixture was poured into water and extracted by EtOAc twice. The organic layer was washed by 1 N hydrochloric acid twice, 1 N sodium hydroxide twice, brine and dried over sodium sulfate. After evaporation, the product was purified on silica gel column with 10% methanol in methylene chloride.