反应详情

To a solution of 200 mg of (2RS, 3S)-3-tertbutoxycarbonylamino-4-cyclohexyl-2-hydroxybutyric acid which was prepared in Reference Example 4, 0.06 ml of morpholine and 13 mg of 1-hydroxybenzotriazole in 6 ml of ethyl acetate was added 150 mg of dicyclohexylcarbodiimide with stirring under ice-cooling, and the mixture was stirred for 16 hours at room temperature. The reaction mixture was cooled, and filtered to remove insoluble materials. The filtrate was washed successively with an aqueous citric acid solution, a 5% aqueous sodium bicarbonate solution and a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate, and evaporated under reduced pressure to obtain 296 mg of 4-[(2RS, 3S)-3-(tertbutoxycarbonyl)amino-4-cyclohexyl-2-hydroxybutyryl]morpholine.

1. temperaturecooling
2. stirringthe mixture was stirred for 16 hours at room temperature
3. temperatureThe reaction mixture was cooled
4. filtrationfiltered
5. customto remove insoluble materials
6. washThe filtrate was washed successively with an aqueous citric acid solution
7. dry with materiala 5% aqueous sodium bicarbonate solution and a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate
8. customevaporated under reduced pressure