An efficient ionic liquid promoted Knoevenagel condensation of 4-oxo-4H-benzopyran-3-carbaldehyde with Meldrum's acid

Green Chemistry Letters and Reviews

Kiran F. Shelke¹ 

关键词: Knoevenagel reaction;    ionic liquid;    4-oxo-(4H)-1-benzopyran-3-carbaldehyde;    Meldrum's acid;   

DOI  :  10.1080/17518250902763101

学科分类：化学（综合）

来源: Taylor & Francis

【 摘 要 】

The green, mild, and efficient synthesis of 2, 2-dimethyl-5-[(4-oxo-4H-chromen-3-yl) methylene]-1, 3-dioxane-4, 6-diones by Knoevenagel condensation of 4-oxo-4H-benzopyran-3-carbaldehydes with Meldrum's acid in presence of 1-benzyl-3-methylimidazolium chloride ((bnmim)(Cl)) ionic liquid at room temperature is reported. This method gives remarkable advantages such as a simple procedure, mild conditions, faster (10–20 min) reactions, and excellent yields. Additionally, the (bnmim)(Cl) was successfully recycled at least four times without significant loss of activity.

【 授权许可】

Unknown