Hafnium chloride tetrahydrofuran complex-catalyzed Diels-Alder cycloadditions of 3-ethoxycarbonylcoumarins with 1,3-dienes under solvent-free conditions

被引：20

作者：

Fringuelli, F ^{[1
]}

Girotti, R ^{[1
]}

Pizzo, F ^{[1
]}

Zunino, E ^{[1
]}

Vaccaro, L ^{[1
]}

机构：

[1] Univ Perugia, Dipartimento Chim, CEMIN, I-06123 Perugia, Italy

来源：

ADVANCED SYNTHESIS & CATALYSIS | 2006年 / 348卷 / 03期

关键词：

cycloaddition; Diels-Alder reaction; hafnium chloride tetrahydrofuran complex; Lewis acid catalysis; solvent-free conditions;

D O I：

10.1002/adsc.200505297

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Hafnium chloride tetrahydrofuran complex (HfCl(4)(.)2THF) is an efficient catalyst for the Diels-Alder cycloadditions of 3-ethoxycarbonylcoumarins 1a-c and 1.,3-butadienes 2x-z under solvent-free conditions furnishing the corresponding cycloadducts in excellent yields. This salt is an air stable Lewis acid and therefore the reactions can be performed in air atmosphere making the procedure simple to be carried out.

引用

页码：297 / 300

页数：4

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