An efficient and convenient protocol for the synthesis of quinoxalines and dihydropyrazines via cyclization-oxidation processes using HClO4•SiO2 as a heterogeneous recyclable catalyst

被引：143

作者：

Das, Biswanath ^{[1
]}

Venkateswarlu, Katta ^{[1
]}

Suneel, Kanaparthy ^{[1
]}

Majhi, Anjoy ^{[1
]}

机构：

[1] Indian Inst Chem Technol, Organ Chem Div 1, Hyderabad 500007, Andhra Pradesh, India

来源：

TETRAHEDRON LETTERS | 2007年 / 48卷 / 31期

关键词：

alpha-bromoketone; 1,2-diamine; HClO4 center dot SiO2; cyclizationoxidation; processes; quinoxaline; dihydropyrazine; heterogeneous; recyclable catalyst;

D O I：

10.1016/j.tetlet.2007.06.036

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

A convenient and straightforward method has been developed for the synthesis of quinoxalines and dihydropyrazines (DHPs) using alpha-bromo ketones and 1,2-diamines in the presence of silica supported perchloric acid (HClO4 center dot SiO2) at room temperature. The quinoxalines and DHPs were presumably formed via cyclization-oxidation. The catalyst works under heterogeneous conditions and can be recycled. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：5371 / 5374

页数：4

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