Table of Contents
Organic Chemistry International
Volume 2013, Article ID 693763, 7 pages
http://dx.doi.org/10.1155/2013/693763
Research Article

Catalytic Synthesis of Pyrano- and Furoquinolines Using Nano Silica Chromic Acid at Room Temperature

1Department of Chemistry, Islamic Azad University, Mashhad, Iran
2Agricultural Researches and Services Center, Mashhad, Iran

Received 29 August 2012; Revised 2 October 2012; Accepted 16 April 2013

Academic Editor: Chao Jun Li

Copyright © 2013 Ali Gharib and Manouchehr Jahangir. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nano silica chromic acid (nano-SCA) is found to catalyze efficiently the three component-coupling reactions of aldehydes, amines, and cyclic enol ethers such as 3,4-dihydro-2H-pyran and 2,3-dihydrofuran under mild conditions to afford the corresponding pyrano- and furanoquinolines in excellent yields with high endoselectivity. Interestingly, 2,3-dihydrofuran afforded selectively endoproducts under the similar reaction conditions. Heterogeneous reaction conditions, easy procedure, short reaction time, and high yields are some important advantages of this method.