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
收藏
页码：5371 / 5374
页数：4
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