反应详情

A mixture of 239 mg (0.76 mmol) of rac-α-[[(1-carbamoyl-1-methylethyl)sulfonyl]methyl]hydrocinnamic acid, 250 mg (0.69 mmol) of (S)-α-amino-N-[(1S,2R,3S)-1-(cyclohexylmethyl)-3-cyclopropyl-2,3-dihydroxypropyl]imidazole-4-propionamide, 77 mg (0.76mmol) of triethylamine, 118 mg (0.76 mmol) of HOBT and 289 mg (0.76 mmol) of HBTU in 10 ml of dimethylformamide was stirred at room temperature overnight. Subsequently, the reaction solution was evaporated to dryness in a high vacuum, the residue was taken up in 75 ml of ethyl acetate and washed twice with 20 ml of saturated sodium hydrogen carbonate solution each time. The ethyl acetate solutions were dried over sodium sulphate and subsequently evaporated under reduced pressure. For purification and separation of the two epimeric products, the residue (450 mg) was chromatographed on 30 g of silica gel using a 97:3:0.1 o mixture of methylene chloride, methanol and ammonia as the eluent. After lyophilization from dioxan and water there were obtained the less polar epimer (S)-α-[(R)-α-[[(1-carbamoyl-1-methylethyl)sulfonyl]methyl]hydrocinnamamido]-N-[(1S,2R,3S)-1-(cyclohexylmethyl)-3-cyclopropyl-2,3-dihydroxypropyl]-imidazole-4-propionamide as a colourless amorphous powder, MS: 660 (M+H)+, and the more polar epimer (S)-α-[(S)-α-[[(1-carbamoyl-1-methylethyl)sulfonyl]methyl]hydrocinnamamido]-N-[(1S ,2R,3S)-1-(cyclohexylmethyl )-3-cyclopropyl-2,3-dihydroxypropyl]imidazole-4-propionamide, likewise as a colourless amorphous powder, MS: 660 (M+H)+.

1. customSubsequently, the reaction solution was evaporated to dryness in a high vacuum
2. washwashed twice with 20 ml of saturated sodium hydrogen carbonate solution each time
3. dry with materialThe ethyl acetate solutions were dried over sodium sulphate
4. customsubsequently evaporated under reduced pressure
5. customFor purification and separation of the two epimeric products
6. customthe residue (450 mg) was chromatographed on 30 g of silica gel using a 97:3:0.1
7. additiono mixture of methylene chloride, methanol and ammonia as the eluent