以氨基酸为原料采用一步法合成了3种氨基酸离子液体,将其代替浓H2SO4用于催化乙酸酐和水杨酸的乙酰化反应,清洁合成阿司匹林.考察了离子液体种类及用量、原料配比、反应温度、时间等因素对合成阿司匹林的影响.结果表明,该离子液体对于合成阿司匹林具有良好的催化效果,在水杨酸20mmol、乙酸酐40mmol、谷氨酸硫酸盐离子液体([Glu] HSO4) 2mmol、反应温度70℃、反应时间30min的条件下,阿司匹林分离产率可达84.8％.增大投料量,产率还会进一步升高,并且离子液体可重复使用.%Three kinds of amino acid-ionic liquids were synthesized by one step method and clean synthesis of aspirin by these ionic liquids instead of concentrated sulfuric acid with acetylation about acetic anhydride and salicylic acid. The effects abqut synthesis of aspirin were studied,such as amount of the ionic liquids,ratio of raw materials, reaction temperature and reaction time etc. The results show that amino acid ionic liquids are excellent catalysts for synthesis of aspirin. Under the conditions that salicylic acid is 20mmol, acetic anhydride is 40mmol, [Glu]HSO4 is 2mmol, reaction temperature is 70℃ and reaction time is 30min, isolated yield of aspirin can reach 84. 8%. Increase the raw materials, the yield will be increase,and the catalyst can be recycled.
展开▼
