反应详情

Nicotinic acid (4.025 g, 0.0327 mol) and N-hydroxysuccinimide (3.763 g, 0.0327 mol) were dissolved in 130 ml of dioxane. Dicyclohexylcarbodiimide (6.75 g, 0.032 mol) in 20 ml of dioxane was added. The reaction mixture was then stirred at room temperature for 3 hours. The dicyclohexylurea which precipitated was removed by filtration and the solvent was removed by rotary evaporation. The crude product was recrystallized from ethyl acetate to give light yellow crystals which were then waashed with anhydrous ether. The product, obtained in 72% yield (5.2 g) and melting at 129°-131° C., has the formula: ##STR40##

1. customThe dicyclohexylurea which precipitated
2. customwas removed by filtration
3. customthe solvent was removed by rotary evaporation
4. customThe crude product was recrystallized from ethyl acetate
5. customto give light yellow crystals which
6. customThe product, obtained in 72% yield (5.2 g) and melting at 129°-131° C.