反应详情

At room temperature, 1 g of 4-[2-(5-cyano-2-benzofuranyl)ethyl]benzoic acid and 578 mg of 1-hydroxybenzotriazole were dissolved in 100 ml of dichloromethane, followed by the addition of 780 mg of 1,3-dicyclohexylcarbodiimide and by subsequent stirring at the same temperature for 3 hours. After distilling off the solvent, the resulting residue was purified by subjecting it to silica gel column chromatography using a chloroform/ethanol mixture as an elution solvent, and the thus purified product was crystallized from a benzene/n-hexane mixture. In this way, 1.1 g of 2-[2-[4-[[(1-benzotriazolyl)oxy]-carbonyl]phenyl]ethyl]-5-benzofurancarbonitrile was obtained in a powdery form.

1. distillationAfter distilling off the solvent
2. customthe resulting residue was purified
3. customthe thus purified product was crystallized from a benzene/n-hexane mixture