摘要
在100℃,无外加溶剂条件下,离子液体功能化二氧化硅催化一系列芳醛和活泼亚甲基化合物进行Knoevenagel缩合反应,以高产率生成相应产物.当反应底物为水杨醛与氰基乙酸乙酯的时候,产物为3-乙氧基羰基香豆素,这是水杨醛和氰基乙酸乙酯缩合关环,再发生氰基醇解的产物.采用离子液体功能化二氧化硅作为反应催化剂,反应后催化剂可回收再利用.
The Knoevenagel condensation of a series of aromatic aldehydes with active methylene compounds proceeded smoothly in the presence of catalytic amounts of ionic liquid functionalized SiO2 at 100℃ without any additional volatile organic solvents, and the desired alkenes were obtained in good purity with excellent yields. In particular, when the Knoevenagel condensation of 2-hydroxybenzaldehyde was conducted with ethyl 2-cyanoacetate, 3-ethoxycarbonylcoumarin was obtained by simultaneous cyclization and alcoholysis of cyanide. In addition, the catalyst can be used recyclably.
出处
《有机化学》
SCIE
CAS
CSCD
北大核心
2007年第4期483-487,共5页
Chinese Journal of Organic Chemistry
