Niobic Acid as a Recyclable Heterogeneous Catalyst for the Solvent-Free Synthesis of Substituted Benzimidazoles

被引：4

作者：

Vieira, Beatriz M. ^{[1
]}

Barcellos, Angelita M. ^{[1
]}

Schumacher, Ricardo F. ^{[1
]}

Lenardao, Eder J. ^{[1
]}

Alves, Diego da Silva ^{[1
]}

机构：

[1] Univ Fed Pelotas UFPel, CCQFA, LASOL, POB 354, BR-96010900 Pelotas, RS, Brazil

来源：

CURRENT GREEN CHEMISTRY | 2014年 / 1卷 / 02期

关键词：

Aldehydes; atom-economic; benzimidazoles catalysis; condensation; green chemistry; heterogeneous; heterocycles; niobic acid; niobium; nitrogen compounds; phenylenediamine; solid catalyst;

D O I：

10.2174/2213346101666131212005735

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We describe here a simple method for the synthesis of several substituted benzimidazoles using niobic acid Nb2O5 center dot 5H(2)O as heterogeneous catalyst and under solvent-free conditions. This new protocol is general and a range of aromatic and aliphatic aldehydes were condensed with o-phenylenediamine furnishing the corresponding 1,2-disubstituted benzimidazoles selectively in good yields. The catalyst was reused up four times giving the respective products in good yields but with a little decreasing in the selectivity.

引用

页码：136 / 144

页数：9

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