反应详情

To tert-butyl 3-hexadecanoyloxyoctadecanoate (16.56 g) was added trifluoroacetic acid (20 ml) and the mixture was stirred at room temperature for 1 hour. Trifluoroacetic acid was removed off under reduced pressure, and to the residue was added dry benzene, followed by evaporation of the solvent. This operation was repeated three times. To a solution of the dried residue in ethyl acetate (250 ml) were added N-hydroxysuccinimide (3.21 g) and N,N'-dicyclohexylcarbodiimide (5.75 g). The mixture was stirred at ambient temperature overnight and then filtered to remove N,N'-dicyclohexylurea. The filtrate was condensed and dried up by high vacuum pump to give N-hydroxysuccinimide ester of 3-hexadecanoyloxyoctadecanoic acid (16.2 g).

1. customTrifluoroacetic acid was removed off under reduced pressure
2. additionto the residue was added dry benzene
3. customfollowed by evaporation of the solvent
4. additionTo a solution of the dried residue in ethyl acetate (250 ml) were added N-hydroxysuccinimide (3.21 g) and N,N'-dicyclohexylcarbodiimide (5.75 g)
5. stirringThe mixture was stirred at ambient temperature overnight
6. filtrationfiltered
7. customto remove N,N'-dicyclohexylurea
8. customcondensed
9. customdried up by high vacuum pump