摘要
实验以水杨醛、丙二酸二乙酯为原料,乙醇钠为催化剂催化合成香豆素-3-羧酸乙酯,再经皂化、酸解环合合成香豆素-3-羧酸。考察了各种反应条件对香豆素-3-羧酸收率的影响。实验结果表明,其最佳工艺条件为:水杨醛用量4.0 g,n(水杨醛):n(丙二酸二乙酯)=1:1.25,金属钠用量0.25 g、无水乙醇20 mL,反应时间2 h,香豆素3羧酸的收率达到90%以上。
Synthesis of coumarin-3-carboxylic acid through sodium ethoxide catalyzed synthesis of coumarin-3-carboxylic acid ethyl ester, followed by saponification, acidolysis cyclization was studied. The optimum conditions were found as follows: n(diethyl malonate) : n(salicylaldehyde) = 1 : 1.25, 0.25 g sodium, 20 mL ethanol, 4.0 g salicylaldehyde and reaction time 2 h. The yield of coumarin -3-carboxylic acid was above 90%.
出处
《精细石油化工》
CAS
CSCD
北大核心
2009年第4期5-7,共3页
Speciality Petrochemicals
关键词
乙醇钠
香豆素-3-羧酸乙酯香豆素-3-羧酸催化
sodium ethoxide
coumarins-3-carboxylate ethyl ester
coumarins-3-carboxylic acid catalytic