Synthesis of pyranopyrazoles, benzopyrans, amino-2-chromenes and dihydropyrano[c]chromenes using ionic liquid with dual Bronsted acidic and Lewis basic sites

被引：22

作者：

Habibi, Davood ^{[1
]}

Shamsian, Atefeh ^{[1
]}

Nematollahi, Davood ^{[1
]}

机构：

[1] Bu Ali Sina Univ, Fac Chem, Dept Organ Chem, Hamadan 6517838683, Iran

来源：

CHEMICAL PAPERS | 2015年 / 69卷 / 04期

关键词：

ionic liquid; synthesis; pyranopyrazoles; benzopyrans; amino-2-chromenes; dihydropyrano[c]chromenes; POT MULTICOMPONENT REACTION; CARBONYL-COMPOUNDS; CATALYTIC-REACTIONS; EFFICIENT CATALYST; DERIVATIVES; GREEN; BISCOUMARIN; WATER;

D O I：

10.1515/chempap-2015-0066

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An efficient ionic liquid with both Bronsted acidic and Lewis basic sites, namely 1,4-dimethyl-1-(4-sulphobutyl)piperazinium hydrogen sulphate (IL1), was synthesised and characterised. IL1 is a "green", homogeneous and reusable catalyst for: i) the synthesis of pyranopyrazoles (Va-Vj) and benzopyrans (VIa-VIj and VIIa-VIIf) at ambient temperature under solvent-free conditions and ii) the synthesis of amino-2-chromenes (VIIIa-VIIIi and IXa-IXi) and dihyropyrano[ c] chromenes (Xa-Xi) at 80 degrees C under solvent-free conditions. The reactions were rapid with excellent product yields. In addition, the double Bronsted acid, 1,4-dimethyl-1,4-bis(4-sulphobutyl)piperazinium hydrogen sulphate (IL2), was prepared to evaluate the cooperation efficiency of their Bronsted acidic and Lewis basic sites as compared with the double Bronsted acidic sites in IL1. (c) 2014 Institute of Chemistry, Slovak Academy of Sciences

引用

页码：586 / 595

页数：10

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