反应详情

90 mg (0.23 mmol) of (S)-α-amino-N- [(1S,2S,4S)-1-(cyclohexylmethyl)-2-hydroxy-4-isopropyl-5-hexenyl]imidazole-4-propionamide and 0.047 ml of Hunig base in 2ml of acetonitrile were treated dropwise at room temperature with a solution of 60.7 mg of (S)-α-[(3,3-dimethylbutyryl)oxy]hydrocinnamic acid and 101 mg of BOP in 5 ml of acetonitrile. The mixture was stirred at room temperature for 4 hours, subsequently poured into 2N sodium bicarbonate solution and extracted with methylene chloride. The organic phase was washed with ammonium chloride solution and dried over sodium sulfate. The solvent was removed under reduced pressure and the residue was chromatographed on silica gel. After elution with a 20:1 mixture of methylene chloride and methanol, there were obtained 50 mg (34%) of (S)-α-[[(S)-1-[[(1S,2S,4S)-1-(cyclohexylmethyl)-2-hydroxy-4-isopropyl 5-hexenyl]carbamoyl]-2-imidazol-4-ylethyl]carbamoyl]phenethyl 3,3-dimethylbutyrate as a yellow oil. MS: 637 (M+H)+.

1. extractionextracted with methylene chloride
2. washThe organic phase was washed with ammonium chloride solution
3. dry with materialdried over sodium sulfate
4. customThe solvent was removed under reduced pressure
5. customthe residue was chromatographed on silica gel
6. washAfter elution
7. additionwith a 20:1 mixture of methylene chloride and methanol