Highly efficient solvent-free synthesis of pyranopyrazoles by a Bronsted-acidic ionic liquid as a green and reusable catalyst

被引：60

作者：

Ebrahimi, Javad ^{[1
]}

Mohammadi, Ali ^{[2
]}

Pakjoo, Vahid ^{[1
]}

Bahramzade, Ehsan ^{[1
]}

Habibi, Amir ^{[1
]}

机构：

[1] Islamic Azad Univ, Mashhad Branch, Dept Chem, Mashhad, Iran

[2] Ferdowsi Univ Mashhad, Fac Sci, Dept Chem, Mashhad, Iran

来源：

JOURNAL OF CHEMICAL SCIENCES | 2012年 / 124卷 / 05期

关键词：

Pyranopyrazoles; solvent-free synthesis; multicomponent reaction; ionic liquid; heterogeneous catalysts; BAEYER-VILLIGER-OXIDATION; ONE-POT SYNTHESIS; SILICA-GEL; IRRADIATION; DERIVATIVES; MICROWAVE; MILD;

D O I：

10.1007/s12039-012-0310-9

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A simple, green and efficient protocol for synthesis of dihydropyrano[2,3-c]pyrazole derivatives is developed by a four component reaction of various benzaldehydes, ethyl acetoacetate, hydrazine hydrate and malononitrile in the presence of 3-methyl-1-(4-sulphonic acid)butylimidazolium hydrogen sulphate [(CH2)(4)SO3HMIM][HSO4], an acidic ionic liquid and as a catalyst, under solvent-free conditions. The key advantages of this process are high yields, shorter reaction times, easy work-up, purification of products by non-chromatographic method and the reusability of the catalyst.

引用

页码：1013 / 1017

页数：5

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