ZrCl4/[bmim]BF4-catalyzed condensation of salicylaldehydes and malononitrile: Single-step synthesis of 3-cyanocoumarin derivatives
作者:Hassan Valizadeh、Manzar Mahmoodian、Hamid Gholipour
DOI:10.1002/jhet.593
日期:2011.7
A versatile and efficient single‐step route to 3‐cyanocoumarins via Knoevenagel condensation of salicylaldehydes and malononitrile using ZrCl4 as the catalyst (15 mol %) in ionic liquid 1‐(n‐butyl)‐3‐methylimidazolium tetrafluoroborate as reaction medium and catalyst is described. The novel procedure features single step, short reaction time, good yields, and simple workup. J. Heterocyclic Chem., (2011)
在离子液体1-(n-丁基)-3-甲基咪唑四氟硼酸作为反应介质和催化剂的情况下,使用ZrCl 4作为催化剂(15 mol%),通过水杨醛和丙二腈的Knoevenagel缩合,通向3-氰基香豆素的通用高效方法描述。该新方法具有一步法,反应时间短,产率高和后处理简单的特点。J.杂环化学。(2011)。