反应详情

N-(3-hexadecanoyloxyoctadecanoyl)-β-alanine (1.47 g) prepared by the method of Preparation B-5 and N,N'-dicyclohexylcarbodiimide (412 mg) were added to a mixed solution of dichloromethane (20 ml) and dioxane (20 ml). The resulting mixture was stirred for 15 minutes. Then, a solution of dibenzyl L-glutamate (650 mg) in dioxane (10 ml) was added thereto over a period of 30 minutes. The mixture was stirred for 2 hours at room temperature and allowed to stand overnight. The precipitated N,N'-dicyclohexylurea was removed off by filtration, and the filtrate was concentrated under reduced pressure. The residue was recrystallized from ethanol to afford crystals of dibenzyl N-[N-(3-hexadecanoyloxyoctadecanoyl)-β-alanyl]-L-glutamate (850 mg).

1. waitover a period of 30 minutes
2. stirringThe mixture was stirred for 2 hours at room temperature
3. waitto stand overnight
4. customThe precipitated N,N'-dicyclohexylurea was removed off by filtration
5. concentrationthe filtrate was concentrated under reduced pressure
6. customThe residue was recrystallized from ethanol