反应详情

Into the same device as used in Example 1 were placed 77.3 g (0.28 mole) ofmethyl (2S)-2-benzyloxycarbonylamino-4-cyanobutyrate, 27.3 g (0.42 mole) ofsodium azide, 57.7 g (0.42 mole) of triethylamine hydrochloride and 280 ml of toluene. Thereafter, the mixture was heated to a temperature of 82° to 83° C. to undergo a reaction for 24 hours. Subsequently the same procedure as in Example 1 was repeated, and crystalswere collected by filtration. Further, the crystals were recrystallized from methanol and water, filtered and dried, giving 67.7 g (0.21 mole) of methyl (2S)-2-benzyloxycarbonylamino-4-(tetrazole-5-yl)butyrate (yield 75.8% based on methyl (2S)-2-benzyloxycarbonylamino-4-cyanobutyrate). The reaction is illustrated below with chemical formulas: ##STR27##

1. temperatureThereafter, the mixture was heated to a temperature of 82° to 83° C.
2. customa reaction for 24 hours
3. filtrationcrystalswere collected by filtration
4. customFurther, the crystals were recrystallized from methanol and water
5. filtrationfiltered
6. customdried